Documentaries
- 🌐 Official YT Documentary Channels - YouTube Documentary Channels
- ⭐ IHaveNoTV
- ⭐ DocumentaryArea / Remove Watermark (or use PIP)
- ⭐ Documentary+
- ⭐ 1337x Documentaries / Torrent
- LearnOutLoud
- Top Documentary Films
- Thought Maybe
- Media Burn Archive
- DocumentaryHeaven
- ARTE
- Documentary Network
- Documentary Storm
- Documentary Tube
- Rocumentaries
- WatchDocumentaries
- PBS
- Nat Geo
- Folkstreams
- Films For Action
- r/Documentaries
- Videoneat
- MVGroup
Courses
Streaming
- 🌐 Awesome Courses - Courses
- 🌐 Limnology - Educational YouTube Channels
- ⭐ edX - Courses / Downloader
- ⭐ MitOpenCourseWare - Courses
- ⭐ Khan Academy - Courses / Downloader
- ⭐ Class Central - Search for Courses
- Course CSE - Multi-Site Course Search
- Educational Hub - Courses
- Git.ir - Courses
- OpenLearn - Courses
- Alison - Courses
- Saylor Academy - Courses
- EbookFoundation Courses - Courses
- OpenCulture - Courses
- DigitalGarage - Google Courses
- OpenHPI - Courses
- OLI - Courses
- LearnOutLoud - Documentaries / Courses
- Video Lectures - Lectures
- Yale Courses - Lectures / YouTube
- Gresham College - Lectures / YouTube
- Crash Course - Topic Crash Courses
Downloading
- Note - Use redirect bypassers to skip annoying link shorteners.
- 🌐 Free-Courses-For-Everyone - Course Site Index
- ⭐ TutFlix - Courses / Drives / Sign-Up Opens Fridays
- ⭐ HackNation - Courses
- ⭐ tut4dl - Courses / Request Guide
- ⭐ Course Busters - Course Busters Access
- FreeCourseSite, 2 or Docspedia - Torrenting Sites / Use VPN
- technet24 - Courses
- AfraTafreeh - Courses
- learningDL - Courses / Leech Required
- LinkedIn_Learning - LinkedIn Courses
- CertCommunity - IT Cert Courses
Learning Sites
- 🌐 Learn Anything - Learning Resource Search / Free Method / Discord / GitHub
- 🌐 Wakelet - Learning Resources
- 🌐 OpenCulture - Learning Resources
- 🌐 OSSU - Learning Resources / Discord
- 🌐 The Free Learning List - Learning Resources
- 🌐 Awesome Educational Games - Educational Games Index
- ⭐ r/coolguides or coolguid.es - Guides & Tutorials
- ⭐ r/educationalgifs - Learn with GIFs
- ⭐ r/explainlikeimfive - Have Anything Explained Very Simply
- ⭐ The Punctuation Guide - Punctuation Guide
- Basic Knowledge 101 - Knowledgebase / Topic Learning
- media.ccc.de - Educational Presentations
- Ted Talks - Inspiring and Educational Talks
- Stack Exchange or Quetre - Q&A Communities
- ISODN - International Science Olympiads Discord Community
- Learn About or Learning Coach - Google's Educational Search AIs
- AFAIK - Learning Map / Discord
- AnimaGraffs - Animated Infographs
- Memory Toys, Dual N-Back or BrainScale - Memory Tests / Training
- Information Is Beautiful or HalcyonMaps - Data / Information / Infographics / Visualizations
- HowStuffWorks or CoolMindMaps - Learn How Things Work
- Common Misconceptions - Common Misconception Index
- masterWiki - MasterClass Classes Republished as wikiHow Articles
- LitCharts - Literature Guides
- Appropedia - Sustainability Wiki
- British & Exotic Mineralogy - Mineralogy Database
- AirVectors or PlaneSpotters - Aircraft Indexes / Images
- ShipSpotting - Ship Index / Images
- HerbologyY - Herbology / Telegram
- Alchemy Forums - Alchemy Forum
- P2PU - Join Learning Groups Using Free Courses
Skills / Hobbies
- HamExam, AA9PW or HamStudy - Ham Radio Practice Exams
- ARRL - Amateur Radio Resources / Learning / Exam Search / Question Pools
- Make it Yourself - 1000 DIY Projects / Video
- Knots 3D, Animated Knots or NetKnots - Learn to Tie Knots
- Ian's Shoelace Site - Learn to Tie Shoelaces
- Perry Morse, Morse Typing Trainer or ICWO - Learn / Practice Morse Code
- Lock Picking 101 - Lock Picking Forum
- LibraryOfJuggling - Juggling Technique Database
- diyhpluswiki - DIY Biohacking
- BeatBlackjack - Learn Blackjack Card Counting
- Excel Practice Online - Excel Practice / Guides
- ActivistHandbook - Campaigning / Activism Guides
- Bridge Command - Bridge Command Ship Simulator
- HypnosisChatBooks - Hypnosis / Telegram
- AXM Paper Space Scale Models - Spacecraft Paper Models
- Erowid - Psychoactive Information
- PsychonautWiki - Psychonautics Wiki
- Shroomery - Magic Mushroom Forum
Interactive Learning
- ⭐ PhET, Cognito, Academo - Interactive Lessons
- Explorabl.es, MinuteLabs, Wikiversity or Learnamic - Quizzes / Guides / Games
- LabXchange, JavaLab or EduMedia - Interactive Science Simulations
- Matthen - Math & Science Animations
History
- ⭐ Historic Films or National Film Preservation Foundation - Historic Footage / Films
- ⭐ Histography - History Timelines
- ⭐ MorbidKuriosity - Dark History, Conspiracies, Crime, Myths, etc.
- Smithsonian Institution Archives or RareHistoricalPhotos - Historical Photos / Documents
- Imperial War Museums - Historic War Footage
- Museo - Museum Search
- Wonderous - Learn About Ancient Structures
- Shorpy - Historical Photos
- EyewitnesstoHistory - Historical Eyewitness Testimonies
- HMDB - Historical Marker Database
- ManuscriptMiniatures - Medieval Manuscript Images
- BlackPast - African History Encyclopedia
- Athena - Greek History Encyclopedia
- Theoi - Greek Mythology
- Germanic Mythology - Germanic Mythology
- Inuit Myths - Inuit Mythology
- Mission US - American History Learning Games
- OnThisDay or Curiosity Of The Day - What Happened on Specific Days
- Royal Constellations - Royal Family Ancestral Visualization
- Historical Tech Tree or Calculating Empires - Historical Discovery / Tech Timelines
- ETHW - Engineering and Technology History Wiki
- Royal Armouries Collections - Ancient Armaments Museum
- NuclearWeaponArchive - Nuclear Weapons History
- 911 Realtime - 9/11 in Real-Time
- The Food Timeline - Food History Timeline
- Historical Recipes - Historical Recipes Site Index
- Arachne - Ancient Sculpture Image Archive
- SmartHistory - Art / Cultural Object History
- gwulo - Historical Hong Kong Photo Archive
- CARI - Design Aesthetics History
- ChinesePosters - Chinese Propaganda Poster History
- Historical Fashion - Historical Fashion Resources / History
- PessimistsArchive - Historical Technological Pessimism Archive
- Time Portal - History Clip Guessing
Mythology / Folklore
- ABookOfCreatures, Demons of the Deep or Bestiary - Mythological Encyclopedias
- GodChecker - Religion / Mythology History
- ObscUrban Legend Wiki - Mythology / Urban Legends
- Encyclopedia Mythica - Mythology / Folklore / Religion
- Mythology.net - Mythology / Religion
- Japanese Mythology or Yokai - Japanese Mythology / Folklore
Philosophy
- ⭐ Stanford Encyclopedia of Philosophy, IEP or nLab Philosophy - Philosophy Encyclopedias / Search
- Philosophy Bro, Reasoned, TheDailyIdea or PhilosophyBasics - Philosophy Resources / Learning
- Wireless Philosophy - Philosophy Videos
- 1000-Word Philosophy - 1000-Word Essays on Philosophical Topics
- Untools - Better Thinking Tools
- Brainkit - Learn Helpful Principles
- Art of Manliness - Develop Life Skills
- VisualizeValue - Life Lesson Visualizations
- Sketchplanations - Explanation Sketches
- IEoP, YouLogicalFallacyIs, FallacyFiles or LogicalFallacies - Learn about Logical Fallacies
- YourBias.is - Learn about Biases
- Kialo - Debates / Discussion
- Umsu - Analytic Tableaux Generator
- Proofs - Natural Deduction Proof Checker
- PropCalc - Propositional Logic Calculator
- ModalLogic - Model Logic Playground
- Logitext - Sequent Calculus Tutorial
- WikEnigma - 'Known Unknowns' Wiki
- The Trolley Problem Game - The Trolley Problem
- Social Engineers - Social Engineering Guides
Music
- 🌐 Awesome Music Theory - Music Theory Resources
- ⭐ Muted, Open Music Theory / 2, Chromatone, Teoria, SimplifyingTheory, LightNote or Music Theory - Music Theory
- AudioZ - Audio Courses / Forum
- Helio / GitHub or NoteHeads - Music Composition Tools
- MusicKit, Tuner or Tone Generator - Metronome, Tuner & Tone Generators
- Tuner Ninja - Instrument Tuner
- Circle of Fifths - Visualize Notes, Cords and Keys
- ScoreCloud, ChordReader2 or Chordify - Chord Detection / Transcriber
- Arpeggiator, Chordi or AutoChords - Chord Progression Generators
- HookTheory - Chord Progression Library
- Piano Scribe - Piano Transcriber
- LilyPond - Music Engraving Program
- Learning Music or Musicca - Music-Making Lessons
- Midiano / Discord, Piano Trainer / GitHub, Chord Nebula, sightread or PianoCheetah - Piano Practice / Learning
- Keyboard Connect - Keyboard Tutoring App
- TrueToneGuitar, Songsterr, FAChords or ChordBook - Guitar Tools
- FretFlip, Oolimo, StringScales, My Fretboard Trainer, QFGM or GuitarScale - Learn Guitar Scales / Chords
- JamStart - Spotify Chord Charts
- #fretflip - Create / Print Guitar Scales & Chord Charts
- JustinGuitar or Guitarsix - Guitar Lessons
- Ultimate Guitar - Guitar Tabs
- Chorder - Guitar Chord Finder
- Guitar Fretboard, Fretastic or Gitori - Virtual Fretboards / Guitar Lessons
- coop3rdrumm3r or FreeDrumLessons - Drum Lessons
- 911tabs or Finger Tabs - Tabs
- Jazz Improvisor - Improvised Jazz
- LearningSynths - Synthesizers
- Sight Singing Factory - Sight Singing Practice
- A-Complete-UTAU-Tutorial-For-Beginners - UTAU Tutorial
- PerfectPitch - Pitch Recognition Practice
- MusicStaff - Music Teacher Search
- ChiffAndFipple - Irish Traditional Music Forum
- MIMO - Musical Instrument Database
- VGM Sound Sources - VGM Sound Sources / Discord
Art / Editing
- 🌐 Creator Resources - Art & Animation Resource Index
- 🌐 AwesomeAnimeResearch - Anime Machine Learning
- ⭐ Art Study Guide - Art Study Guides / Tips
- ⭐ Drawabox, Drawing Starter Pack Playlist, FarsiTuts or Bill Martin's Guide to Drawing - Drawing Lessons
- ⭐ Proko - Figure Drawing Lessons
- ⭐ PaintingTube, MarcoBucci, Alphonso Dunn, Feng Zhu FZD, Ctrl+Paint, Art Fundamentals or Circle Line Art - Art Video Tutorials
- Ubu - Avant-Garde Artifacts
- online-courses - Art / Design Courses
- TutsPlus - Creative Courses
- Curriculum for the Solo Artists - Self-Taught Artist Curriculum
- DoArtDaily - Daily Art Challenges
- Character Design References - Character Design Visual Library
- FloobyNooby, JMMStoryboardTips or A Guide to Storyboards - Storyboard Guides
- Settei Dreams - Anime Production Materials
- Anime Study General - Anime Production Community
- McLelun - Anime Style Background Tutorial
- AnimeOutline - Anime / Manga Drawing Tutorials
- Design Tuts - Design Tutorials
- PhotoshopTutorials.ws - Photoshop Tutorials
- DomDesigns - Illustrator Tutorials
- PhotoshopTraining, Phlearn or PiXimperfect - Photoshop YouTube Tutorials
- The Bézier Game - Pen Tool Practice
- ArtWithFlo - Procreate Tutorials
- Paintable - Digital Art Tutorials
- Pedro's Pixel Art Tutorials or SLYNYRD - Pixel Art Tutorials
- MetPublications - Art Learning Books
- GraphicsCodex - 3D Computer Graphic Guides
- DrawingNow - Learn to Draw
- Drawingbooks.org - Old Drawing Books
- Line of Action, Timed Figure Poses, LoveLifeDrawing or Daily Life Drawing Sessions - Figure Sketch Tools / Lessons
- AnatomyArchive - Human Anatomy Drawing Tutorials
- Artist Reference - Photo References for Artists
- Reference Angle - Human Photo Reference Search
- x6ud - Animal Photo Reference Search
- Thomas Romain Perspective - Perspective Guide
- Dimensions - Object Dimension Reference
- DevinKorwin Color Guide - Color in Paintings Guide
- Draw Mix Paint - Learn Oil Painting
- Painting Demos - Painting Demonstrations
- cg_tuts or cgreferenceshub - CG Tutorials
- Seven Camels - Storyboarding Tips / Learning by Disney's Head of Story
- Agora - Animation Learning Community / Tutorials / Discord
- AMV101 - Animated Music Video-Making Guides
Geography / Sociology
🌐 Awesome Datasets - Public Datasets
🌐 Country Infographics - Country Infographic Images
⭐ Worldometer, TheScaleOfLife, WorldBank, US Census, DataUSA, Data.gov or UN Data - World Data & Statistics
⭐ Our World in Data - World Problem Database
⭐ The Atlas of Economic Complexity - Global Economic Growth Data
⭐ Soar - Digital Atlas
⭐ Integrity Index - US Political Finance Integrity Database
⭐ Ekvis / Subreddit / Discord, Seterra, LizardPoint, Worldle, Learn World Map or Teuteuf - Geography Guessing / Quizzes
Maps.com - Interesting / Educational Maps
AntipodesMap - Find Antipodes
The True Size or True Size of Countries - Compare Country Size
NationsEncyclopedia - Location / Population Data
City Data - US City Data
Data Commons or Engaging Data - Data Visualizations
Global Consciousness Project - Real-Time Global Consciousness Data
GovTrack - US Government Legislation Tracking / Votes
OpenSecrets - Government Money Tracking
If It Were My Home, GlobalEdge or MyLifeElsewhere - Country Data Comparisons
WorldPoverty - World Poverty Data
PixelWealth - Wealth Inequality Visualization / Facts / GitHub
Unequal Scenes - Scenes of Inequality Around the World
Dollar Street - Compare Homes by Country / Income
EverySecond - Visualize Per Second Data
OEC or UN Comtrade - Global Trade Data
Statista - Market Statistics
Netblocks - Find Impact of Internet Shutdown on Economy
Rulers.org - World Heads Of State & Government Database
World Births and Deaths - World Birth / Death Rates Visualization
DataUNODC - Drug / Crime Statistics
Gun Violence Archive - Gun Violence Statistics
Incarceration in Real Numbers - Incarceration Visualization / Facts
Expatistan - Cost of Living Calculator
Climate Data or Climate Explorer - Climate Change Data
ExtremeWeatherWatch - Extreme Weather Data / Tracking
En-ROADS - Climate Solutions Simulator
Global Volcanism Program - Volcano Information Database
8000ers - Mountain Visualization & Info
iCivics - U.S. Law Learning Games
WorldLicensePlates - World License Plate Index
Symbols - Symbol Database
Flag Guesser or Flag Match - Flag Quizzes
FlagLog or Flaglookup - Flag Databases
Flag Stories - Flag Design Breakdowns
Virtual Tours
- 🌐 Virtual Museum Resources - Online Museums
- ⭐ CityHop, Travel Remotely, Portal Generator, Walk with Feel, Outside Simulator, Japan Walkaround, CityWalks, Citywalki or Virtual Vacations - Travel Simulators
- Gez.la - Virtual Tours Map
- Wiki Spaces - Virtual Tours
- NaturalHistory - Natural History Museum Virtual Tour
- Digital Giza - Great Pyramid Virtual Tours
- Persepolis Reimagined - Explore Persepolis Recreation
- BelowTheSurface - Archeological Object DB of Amsterdam
- WW2 in 100 Objects - WW2 Museum Virtual Tour
- Spitfire Panorama - Spitfire Mark IX Cockpit Interactve Panorama
- Virtual Vist Tours - Ireland Virtual Tours
- Matterport - Explore Real Places Digitally
- Basilica Viewer - St. Peter’s Basilica Tour
- 360Cities, Zhijianshang or Airpano - 360 Images / Videos
- Smithsonian 3D - Smithsonian 3D Digitization Museum
- The Bayeux Tapestry - Bayeux Tapestry 3D Digitization
Science / Math
Physics
- 🌐 Physics Aviary or Falstad - Physics Tools
- ⭐ The Feynman Lectures - Physics Lectures
- ⭐ Bartosz Ciechanowski, Isaac Physics, PhysicsClassroom, HyperPhysics, MotionMountain or Splung - Physics Lessons / Learning
- ⭐ Physics Simulations, Mujoco, Physics Animations, oPhysics or MyPhysicsLab - Physics Simulations / Animations
- TIB AV-Portal - Science Videos
- PhysicsTravelGuide - Physics Explanations
- nLab Physics - Physics Encyclopedia
- Algodoo - Interactive Physics Tool
- QPaths - Learn Basic Quantum Terms
- quantum - Quantum Physics Learning App
- Physics Forums - Physics / Science Forum
- Physics Olympiads - ISODN Physics Discord Community
- Unihedron - Electromagnetic Radiation Spectrum Chart
- Quantum Web Directory - Science / Tech / Math / Physics
- Virtual-Lab - Interactive Quantum Computing Lessons
- Interactive 4D Handbook - Interactive Fourth Dimension
- Ray Optics Simulation - Light Reflection / Refraction Simulator
- Compare Pendulum or DoublePendulum - Pendulum Simulators
- OpenFoam, PC Progress, Fluid Simulation WebGL, WebGL Fluid Experiment or Sim Flow - Fluid Dynamics Simulators
- SimScale or CFDTool - Fluid Dynamics & Heat Transfer
- Bouncy Balls or Balls Simulation - Ball Physics Simulator
- WebGL Water - Water Simulation
- LAMMPS - Molecular Dynamics (MD) Code
- avogadro, 2 or MolView - Molecular Viewers / Editors
- Simuwaerm - Heat Simulator
Math
- 🌐 Awesome Math or Math Resources - Math Resources
- ⭐ Number Academy - Encyclopedia of Numbers
- ⭐ Wumbo - Math Reference Site
- ⭐ Open Source Society University / PT-BR - Math Roadmap / Discord
- ⭐ AoPS Alcumus or MathDash - Adaptive Problem Solving
- ⭐ BetterExplained - Math Guides / Courses
- ⭐ Manim, 2 - Generate Explanatory Math Videos / Videos / Difference Between Versions
- ⭐ WolframAlpha - Searchable Knowledge Base / Mobile (search)
- Wolfram MathWorld, Encyclopedia Of Math or nLab Math - Mathematics Encyclopedias
- Red Blob Games or Mathspad - Interactive Math Sites
- Mathcha, Corca or Math Editor - Online Math Editors
- SequenceDB - Sequence Machine
- OEIS - Encyclopedia of Integer Sequences
- Giac/Xcas - Algebra System
- Algebra Rules - Learn Algebra Rules
- CalculusMadeEasy - Learn Calculus
- CLP - Calculus Textbooks
- Mathematics Roadmap or Learn Mathematics - Mathematics Book Recommendations
- Converter Pro, Rink, Frink, OneConverter or ConvertAll - Unit Converters / Calculators
- MathJax - JavaScript Math Display
- ISciDAVis - Scientific Data Plotter
- Approach0 - Math Formula Search
- MathOnline or Mathigon - Math / Courses
- Professor Leonard, 3Blue1Brown or MisterWootube - YouTube Math Lessons
- Mathispower4u, Andy Math, SchoolYourself, mathhelp, MathPortal, MadAsMaths, Math Planet or CoolMath - Math Lessons / Practice
- CoolMathGames - Math Games
- Cut The Knot - Math Equations / Problems
- IXL Learning - Math Practice / Quizzes
- Pauls Online Math Notes - Math Practice / Guides
- HSCMathsByTopic - HSC Math Practice
- ParkMath or FreeMathHelp - Math Guides
- ISODN Math - ISODN Math Discord Community
- Fourier Transform - Interactive Fourier Transform Guide
- Terence Tao Research - Mathematical Research
- OpenLogicProject - Math Logic Teaching Materials
- Math is Fun - Math Tutorials / Puzzles / Games
- Brainstellar Puzzles - Puzzles from Quant Interviews
- Project Euler - Math / Programming Problems
- IMS - Introduction to Modern Statistics
- Seeing Theory or Stat Trek - Statistics & Probability Tutorials
Engineering
- 🌐 The Engineering Toolbox or EngineersEdge - Engineering Resources
- 🌐 r/EngineeringStudents Resources - Engineering Student Resources
- 🌐 Awesome Mecheng - Mechanical Engineering Resources
- 🌐 Awesome Electronics - Electronic Engineering Resources
- 🌐 Engineering Blogs - Engineering Blogs
- ⭐ r/AskEngineers / Wiki, r/engineering or r/AutomotiveEngineering - Engineering Subreddits
- ⭐ NPTEL or Sabin - Engineering Courses
- ⭐ KiCad / Libraries or Horizon EDA - Schematics Editor / PCB Creator / SPICE Integration
- Formulia - Engineering Formulas / Tools
- Sanfoundry - Engineering Questions & Answers
- CESDB - Engineering Software
- Robot Shop - Robotics Forum
- VisRo Robotics / Discord or VittaScience - Robotics Learning
- Humanoid Robots Wiki - Robotics Courses Index
- Cyberbotics - Robot Simulator
- Diode - 3D Hardware Simulator
- Wokwi - Arduino / ESP32 Board Simulators
- HDLBits - Learn Circuit Design
- Fritzing, SKiDL / GitHub, atopile, EasyEDA or LibrePCB - Electronic Circuit Design Tools
- The Pinouts Book - Pinout Function Reference Guide
- Circuit Steps - Circuit Analysis Tool
- BatteryUniversity - Learn About Batteries
- Electronics Tutorials or Instrumentacion - Electronic Guides
- Hacker Fab - Semiconductor Documentation / Research
- RetroSix - Retro Console Repair Guides + Info / Discord
- /m/engineering - Engineering Multireddit
- Build List - On-Demand Online Manufacturers
Aerospace Engineering
- 🌐 Awesome Aerospace Engineering - Aerospace Engineering Learning Resources
- 🌐 Awesome Flying FPV - Remote Copter / Plane Resources
- r/AerospaceEngineering - Aerospace Engineering Community
- The Rocketry Forum - Project Rocketry Forums / Community
- r/rocketry - Project Rocketry Community / Discord
- NAR - Project Rocketry Safety / Learning / Facebook
- Nakka Rocketry - Project Rocket Technical Archive
- Half Cat Rocketry - Liquid Rocket Motor Info / Resources / X / Discord / GitHub
- ThrustCurve - Rocket Motor Performance Database / GitHub
- Jacobs Rocketry - Project Rocketry Info / Manuals
- MIT Rocket Team - Official MIT Rocket Team Wiki / Resources Wikipedia
- OpenRocket - Model Rocket Simulator / Discord / GitHub
- Tripoli Rocketry - High-Powered Rocket Resources / Info
- RocketPy - High-Powered Rocket Simulator / Discord
- openMotor - Internal Ballistics Simulator
- Flight Mechanics - Aircraft Flight Mechanics Learning
- OpenVSP - Aircraft Geometry Tool / GitHub
- Airfoil Tools - Airfoil Coordinates / Dat Files
- OscarLiang.com - FPV Drone Tutorials / Reviews
- OpenDroneMap - Drone Mapping Software
- Stolen Drone - Stolen Drone Info
Chemistry
- 🌐 Wolfram Alpha Chemistry - Chemistry Calculators / Tools
- ⭐ Lab Safety Guide / Intro
- ⭐ LibreTexts Chemistry - Chemistry Texts
- ⭐ Internet Chemistry - Chemistry Search Index
- Chemistry Basics - Basics of General, Organic, and Biological Chemistry
- ChemicalAid, WebQC or Chemequations - Chemistry Calculators / Element Tables
- QuickChem - Chemistry Calculator
- PubChem, MOTM, NIST or EssentialChemicalIndustry - Chemistry Wikis
- ChemistrySteps, Science Geek or DocBrown - Chemistry Practice / Guides
- Cliffnotes Chemistry / Organic Chemistry I / Organic Chemistry II, Chem Wiki or chemguide - Study Guides
- ReactionFlash / iOS - Chemical Reaction Flashcards
- Compound Interest - Chemistry Infographics
- ChemistryTalk - Tutorials / Experiments / Elements / Reference Articles
- Sciencenotes - Periodic Tables / Chemistry Projects and Questions
- Organic Chemistry or Synarchive - Organic Reactions
- CommonOrganicChemistry - Common Reactions / Common Reagents
- name-reaction - List of Name Reactions
- ChemTube3D - Interactive 3D Chemistry Animations
- ChemSpider - Chemical Structures
- Merck Index - Online Merck Index
- Organic Chemistry Data - Organic Chemistry Data
- IGOC - Illustrated Glossary of Organic Chemistry
- Colorado Chemistry Simulations - Chemistry Animations
- Chemical Forums - Chemistry Forums
- ISODN Chemistry - ISODN Chemistry Discord Community
- Arkivoc - Journals
- WebQC Balance Calculator - Chemical Equation Balance Calculator
- Chemexper Chemical Directory - Chemical Directory
- OrgSyn - Chemistry Prep Guides
Periodic Tables
- ⭐ Ptable - Interactive Table
- ⭐ Images-of-elements - Element Images
- ⭐ periodic-table.org or Material Properties - Material / Element Learning Resources
- Atom Animation / GitHub, Graph Overflow or 3D Periodic Table - 3D Visualizations of Atoms
- Atomic - Periodic Table Mobile App
- The Periodic Table Of Elements - Interactive Table
- periodic-table.io - Interactive Table
- Periodic Table App - Interactive Table
- WebElements - Interactive Table
- Photographic Periodic Table - Image-Based Periodic Table w/ Physical Examples
Biology
- ⭐ Wikispecies or The Catalogue of Life - Species Databases
- ⭐ Animalia or A-Z Animal - Animal Encyclopedia
- ⭐ OneZoom - Tree of Life Explorer
- ⭐ Lost and Found Nature - Rediscovered Animal / Plant Database
- BiologyOnline - Biology Articles
- Science Geek - Biology Study Guides
- Biodiversity Heritage Library - Biodiversity Research
- Alien - Artificial Life Simulator / GitHub / Video
- Metazooa - Species Connection Game
- Phenome10K - Biological / Palaeontological 3D Scans
- RecentlyExtinctSpecies - Recently Extinct Species Database
- UniProt - Protein Database
- iNaturalist - Organism Identification
- Ocearch - Track Marine Life
- The Deep Sea - Interactive Deep Sea Life Guide
- Pattern Radio - Listen to Whale Songs
- eBird, Audubon or AllAboutBirds - Bird Species Databases / IDs
- EuroBirdPortal - European Bird Distribution Map
- BirdSounds - Thousands of Bird Sounds Visualized
- Merlin or whoBIRD - Bird Picture / Sound Identification
- Featherbase - Bird Feather Database
- BugGuide - Insect Identification Community
- AntWeb - Ant Species Database
- Macroinvertebrates - Freshwater Macroinvertebrates Atlas
- Life Under the Ice - View Antarctic Microbes
- WhyDoCatsAndDogs...? - Pet Q&A Site
- Backyard Chickens - Chicken Raising Forum
- DinosaurPictures - Dinosaur Info / Images
- Pteros - Pterosaur Database
- WFO - Plant Database
- The Ferns - Tropical Plant Database
- ISODN Biology - ISODN Biology Discord Community
Med School
- 🌐 r/MedicalSchool Wiki - Med School Resources
- ⭐ Khan Academy - Physiology / Pathology Overviews
- ⭐ Afratafreeh - Medical Video Courses and Books
- ⭐ Radiopaedia, Radiology Assistant or Radiology Education - Radiology Resources
- ⭐ Stop the Bleed - Free First Aid Video Courses / Resources
- MDCalc, MSD Manuals or Epocrates - Medical Reference Sites / Tools
- Geeky Medics, UC San Diego CG or Easy Auscultation - Clinical Guides
- Glass AI - Medical Diagnoses' Training AI
- Get Body Smart or University of Michigan Anatomy - Anatomy Guides
- Zygote Body, AnatomyLearning or Biodigital - 3D Human Anatomical Models
- Inner Body - Anatomy Atlas (2D&3D)
- NIH Print - Biomedical Science 3D Models
- Sectional Anatomy - Cross Sectional Educational MRI / CT Scans
- University of Minnesota Histology or University of Leeds Histology - Histology Guides
- Tulane University Pharmacology - Pharmacology Info & Quizzes
- Antibiotics Summary - Antibiotics Summary Image
- Healio ECG Review, ECG Library or Litfl - ECG Information
- The ECG Course - ECG Video Course
- ECG Wave-Maven: Self-Assessment Program - ECG Practice
- Hyper Heart - Massey University Heart Animation
- Emergency Medicine Cases - EM Case Index
- EMCrit - Emergency Medicine Information
- DeployedMedicine (signup) or TCCC - Combat Medicine Videos
- EMRap - Emergency Medicine Videos
- Calgary Guide - Disease Pathophysiology / Manifestation Flow-Charts
- MalaCards - Human Disease Database
- Epidemic Calculator - COVID Data
- Pathology Outlines - Pathology Info
- University of Utah Pathology - Pathology Guide
- The Iowa Virtual Slidebox - Pathology Atlas Software
- Nextstrain - Pathogen Evolution Tracking
- HemOnc - Hematology / Oncology Reference Site
- DermNet - Dermatology Reference Site
- EyeWiki - Eye Encyclopedia
- Passmedicine - UCAT Practice Questions
- UCAT Score - UCAT Score Converter
- r/medicalschoolanki - Community for Medical Anki Cards
- CRAM - Medical Flashcards
Space
- ⭐ r/Space - Space Subreddit
- ⭐ Space Dashboard - Space Live Stream Dashboard
- ⭐ NASA - National Aeronautics and Space Administration Website / Images / Audio / Documents / APIs / History
- ⭐ March to the Moon, Apollo Image Atlas or ApolloArchive / Flickr - Moon Landing Images
- Interactive Apollo Missions or FirstMenOnTheMoon - Apollo in Realtime
- Marspedia - Mars Wiki
- ESA - European Space Agency Website
- JAXA - Japanese Space Agency Website / Images / Videos
- CSA - Canadian Space Agency Website
- ISRO - Indian Space Research Organization
- Space.com - Space News
- Encyclopedia Astronautica - Space Encyclopedia
- NASA History or NASA Ebooks - NASA Books
- Cosmos2025, Map of the Universe, Scale of the Universe, AndroidCelestia or SpaceEngine / Old Versions - Interactive Universe Scales
- NASA's Eyes or Celestia - 3D Space Visualizations / Solar System
- ExoplanetExplore - Interactive Exoplanet Visualization
- ExoplanetArchive - Exoplanet Database
- RGV Aerial Photography - Aerial Photography Community / News / X
- TheCMB - 3D Cosmic Microwave Background Model
- ISODN Earth Science - ISODN Earth Science Discord Community
Astronomy
- 🌐 Astronomy Resources - Astronomy Resources
- ⭐ JPL Photojournal or JPL Images - JPL Planetary Image Archives
- ⭐ In The Sky - Astronomy News / Interactive Guides
- ISODN Astronomy & Astrophysics - ISODN Astronomy & Astrophysics Discord Community
- ViewSpace - Space Videos and Digital Interactives
- Planet Globe - Virtual Globes
- Sky Calendar - Astronomy Calendar
- Nights on Earth - Astronomical Event Calendar
- Space Weather News or SpaceWeather - Space Weather Updates / Videos
- SunCalc, ShadeMap or MoonCalc - Sun / Moon Position
- Earth and Moon Viewer - Earth / Moon Latitude and Longitude Viewer
- SDO Dashboard - Live Sun Feed
- WikiSky, SkyViewer or 100,000 Stars - Interactive Star Visualizations
- CelesTrack - Earth Orbit Visualization
- TheSkyLive or Atlas of Space - Solar System Simulators / Information
- Space Object Comparison - Compare Sizes Of Celestial Objects
- 1 Pixel moon, LightYear or OMG SPACE - Solar System Scale Model
- Astrogeology - Planetary Maps
- AndroidPlanisphere - Android Star Chart
- Aladin - Astronomical Image quar fViewer / Lite Version
- Siril - Astronomical Image Processor
- ESAsky - Public Astronomical Data
- Stellarium-Web or Stellarium / GitHub - Virtual Stellariums
- WorldwideTelescope - Interactive Telescope Data / Home Page / GitHub
- ESA Hubble, SpaceTelescopeLive or HubbleSite - Hubble Telescope Images
- James Webb Space Telescope or ESAWebb - Webb Space Telescope Sites
- Webb Compare - Webb / Hubble Images
- APOD - Daily NASA Astronomy Images
- ESO Images, NASA2Explore or Astrobin - Astronomy Images
- r/SpacePorn or r/Astrophotography - Astrophotography Subreddits
- Meteor Showers - 3D Meteor Shower Visualization
- Live Meteors - Live Meteor Radio Echoes
- Clear Dark Sky - Star Gazing Weather Forecasts
- Dark Site Finder, DarkSkyMap or GoStarGazing - Star Gazing Site Locators
Spacecraft
- ⭐ EarthData - Daily Satellite Replays
- ⭐ Visible Earth, SpaceFromSpace, GOES-16 Satellite Imagery or Sentinel Hub - Satellite Imagery
- NASASpaceFlight - Launch Livestreams / News / Forum / X
- Next Spaceflight / X / Discord, nextrocket.space or RocketLaunch - Rocket Launch / Space Flight Trackers
- Spaceflight Archive - Rocket Launch History / Visualizations / Stats / X
- TonyBela Infographics - Spacecraft / Rocket Infographics / X
- Ringwatchers - Starship Diagrams / Articles / Community / X / Discord
- Sen - ISS Live Feed + Video Archive / YouTube / X
- ISS In Realtime - Historical ISS Mission Replays / Database
- ISS Sim - ISS Docking Simulator
- Transit Finder, ISS Tracker, Spot The Station or Where The ISS At? - ISS Transit Tracking
- Satellite Map, KeepTrack / GitHub, SGP4 / GitHub, KeepTrackSpace, Find Starlink or Look4Sat - Satellite Orbit Maps / Trackers
- Spacebook - Evaluates / Tracks Satellite Collision Risks & Maneuvers
- Leolabs Space - Low Earth Orbit Simulator
- Orbiter - Spaceflight Simulator / Subreddit / GitHub
- Andegraf Rockets - Rocket Diagrams
Language Learning
Multi-Language
🌐 Language Links, /int/ Guide or r/LanguageLearning Resources - Language Learning Resources
🌐 Speechling - Language Learning Tools
🌐 LexiLogos - Multi-Language Dictionary Index
⭐ Language Transfer - Language Learning Lectures
⭐ Language Reactor, LLPlayer, Trancy or Easysubs - Learn Languages via Videos
⭐ Readlang - Learn a Language via Web Browsing
Language Learners - Language Learning Forum / Community
WordReference, Glosbe or Reverso - Translation Dictionary
ReverseDictionary or OneLook Reverse - Search for Words Using Their Meanings
Comprehensible Input Wiki - Learn Languages via Comprehensible Input
Languagelearning.site - Language Learning Torrents
Refold - Language Learning Roadmap
LingoDeer, Busuu (search) or Duolingo (search) / Tips - Language Learning Lessons
Language Drops / Premium (search) or OkyDoky - Language Learning App with Thematic Vocab
Yojik - Language Learning Courses
DLIFLC - Language Learning Quizzes
Ba Ba Dum - Language Learning Game
LanguageGuide - Visual Language Learning
clozemaster - Context-Based Language Learning
Sounter, LingoClip or LyricFluent - Learn Languages via Music
MORT or Textractor - Learn Languages via Games
Language Roadmap - Foreign Language Media Difficulty Guide
LearnWithOliver - Language Learning Flashcards
MyLanguages, VocabTest, My Little Word Land or 50Languages - Grammar / Vocabulary Language Learning
Verbix - Verb Conjugator
ListLang - Most Used Words in Any Language
Alphabetpedia - Multiple Language Alphabets
Omniglot - Writing System & Language Encyclopedia
LingYourLanguage or Language Squad - Language Identification Test
IPA Reader - International Phonetic Alphabet Reader
Interactive IPA Chart - Learn Phonetic Alphabet Symbols
LocalLingual or DialectArchive - Listen to Accents
TeachMeHebrew - Learn Hebrew
wehewehe - Hawaiian Dictionary
Itchy Feet Comic - Asian Script Differentiation Guide
Language Exchange
- 🌐 The Language Exchange Network, 2 - Language Exchange Communities / Discord
- InterPals
- Episoden
- Tandem
- Conversation Exchange
- RhinoSpike
- HiNative
- LangX / GitHub
- Polyglot
- ISODN Linguistics - ISODN Linguistics Discord Community
English
- 🌐 Many Things - ESL Resources
- 🌐 ESOL - English Learning Resources
- youglish or YouDict - YouTube Word Pronunciations
- Forvo or HowJSay - Pronunciation Dictionary
- The Internet TESL Journal - Resources for EFL and ESL Teachers
- EFSET - English Proficiency Test
- Spellcheck - English Spelling Game
- Learn English Online, ESLFast, AntiMoon, Oxford Online, Learn English or Cambridge Online - English Lessons
- EnglishCentral, EngVid or Voscreen - English Video Lessons
- Frenglish or English E-Reader - English Learning Books
- elllo or Listening Lab - English Listening Lessons / Practice
- TalkEnglish or Stimuler IELTS Speaking Buddy - Improve Spoken English
- WriteAndImprove - Improve English Writing
- Elsaspeak - Practice English Conversations
- yell0wsuit or OxfordLearnersDictionaries - Word Learning Site
- CEFR Lookup - CEFR Word Level Lookup
- Podcasts in English - English Learning Podcasts
- Langeek or Ozdic - Grammar / Vocabulary Language Learning
- EnglishAccentMap - English Accent Videos / Map
- EnglishBanana - English Learning Worksheets
- Free4Talk - English Learning Communities
Japanese
- 🌐 yame dame, Tatsumoto, GaijinRyman, Nihongo, Japanese Resources or AnimeCards - Learning Resources
- 🌐 Japanese Pitch Accent Resources - Japanese Accent Resources
- JapaneseWithAnime or Immersion Kit - Learn Japanese via Anime / Manga
- Nihongo con Teppei - Japanese Beginners Podcast
- JapaneseTab - Japanese Learning Extension
- Minato - Japanese Courses
- Memento - Japanese Learning Video Player
- Supernative or LearnNatively - Learn Japanese via Media
- jidoujisho or Manabi - Learn Japanese via Books
- Learn Japanese Grammar or BunPro - Learn Japanese Grammar
- OJAD - Japanese Accent Dictionary
- DelvinLanguage - Fill in Missing Japanese Words
- Jlpt N3 or JapaneseTest4You - Jlpt Exam Questions / Grammar
- GetKanda, Nihonoari or RealKana - Learn Kana
Korean
- ⭐ Learn Korean - Korean Learning Discord
- Read Korean Letters - Learn Korean Characters
- KR Dict - Korean Learning Dictionary
- HowToStudyKorean - Korean Lessons / Practice
- iksi - Korean Classes
- TalkToMeInKorean - Korean Learning Courses
- Sogang or 90 Day Korean - Korean Learning Lessons
- Mirinae - Korean Word Breakdown
- National Institute of Korean Language - Korean Dictionaries / Expression Practice
- LetsLearnHangul - Hangul Learning
- Hangul Practice - Hangul Recognition Test
- UltimateKorean - Korean Grammar / Vocab Lessons
- KoreanKeyboardLearner - Korean Typing Practice
- Korean Trainer - Korean Numbers & Date Practice
- Hangul - Korean Typing Practice
Chinese
- 🌐 YellowBridge or DigMandarin - Chinese Learning Tools
- 🌐 Cantonese sheik or SinoSplice - Chinese Learning Resources
- ⭐ r/ChineseLanguage - Chinese Learning Community / Discord
- ⭐ Zhongwen - Learn via Classic Chinese Literature
- Train Chinese, ChineseSkill or HelloChinese - Chinese Learning App
- KongLongMandarin, DU Chinese or Dong Chinese - Chinese Lessons
- ArchChinese or Hanzi Grids - Chinese Writing Lessons
- Stroke Order - Learn Chinese Stroke Orders
- HackingChinese - Chinese Learning Articles
- Cantonese.ca, CantoScrolls or Laoshi - Chinese Vocabulary
- MDBG - Chinese Dictionaries
- Maorma - Chinese Tone Practice
- The Chairman's Bao - Chinese Reading Practice / News Articles
- Pleco - Chinese Flashcards / Dictionary
- Chinese Flashcards - Chinese Flashcards
- MandoBot - Mandarin Translation / Segmentation
European
- ⭐ StudySpanish or LibreLingo - Learn Spanish
- SpanishDict - Spanish Translation Dictionary
- SpanishChecker - Spanish Grammar Check
- FluentWithStories - Learn Spanish via Stories
- DreamingSpanish - Spanish Learning Videos
- The French Tutorial - French Learning Tutorials
- TV5MONDE - French Learning Videos
- LCSpeakFrench - Live French Lessons
- Uusi Kielemme - Finnish Learning
- The People's Dictionary - Swedish Translation Dictionary
German
- 🌐 German Resources - German Language Resources
- ⭐ German Discord - German Learning Community
- ⭐ DW German Course - German Learning Course
- ⭐ VHS Lernportal - German Learning Course / Mobile
- Seedlang - German Learning App
- Linguee / 2 or Dict.cc - German Translation Dictionaries
- VerbForm - Create German Verb Anki Flashcards
South Asian
- 🌐 Urdu Resources or UrduNotes - Urdu Learning Resources
- 🌐 Mga Nagmamarunong's Masterlist - Tagalog Learning Resources
- 🌐 Learn Sanskrit or Sanskrit Studio - Sanskrit Lessons and Tools
- South Asian Languages - South Asian Language Learning
- Urdupod101 - Urdu Grammar Overview / Video
- Rekhta Dictionary - Urdu Dictionary
- UBC Sanskrit Learning Tools - UBC Sanskrit Lessons
- Sanskrit Subreddit / Resources - Sanskrit Resources / Discussion
- Ambuda - Sanskrit Dictionaries / Texts
Sign Languages
- ⭐ SpreadTheSign or SL Dictionary - Multi-Language Dictionaries
- ASL Dictionary, StrongASL, LifePrint, ASLCore or HandSpeak - American Sign Language Dictionaries
- Text to Sign - Convert Text to Fingerspelling in ASL or BSL
- Rochester ASL / LSF - ASL / LSF / Click Dictionary
- SignFlow - Interactive Sign Dictionary / Learning
- BSL Dictionary, BSL Signbank, MobileSign or Signd - British Sign Language Dictionaries
- Signbank - Australian Sign Language Dictionary
- NZSL - New Zealand Sign Language Dictionary
- SSC - BSL Academic Term Dictionary
- BKS - British Key Word Signs
- International Sign - International Sign Language
- DeafTec or Tachyo - STEM Sign Dictionaries / Search
- Interpreter Services - Specialized ASL Dictionary
- Sign AIP - Sign-Language Learning Videos
- SignSchool - ASL Learning / Dictionary
- SooSL - Create Custom Sign Language Dictionaries
- ASL Learning - ASL Learning Site
- Learn NZSL - NZSL Learning Site
- HandyBSL - Learn / Practice BSL
- SignLearner - Learn ASL or BSL while Browsing Internet / Chromium
- Signs - ASL Learning AI
- Learn BSL in SignWriting
Game Learning
Rubiks Cube
- 🌐 Cubing.net - Cubing Tools
- ⭐ J Perm, CubeSkills, RubiksTrainer or Easiest Solve - Cubing Tutorials / Practice Resources
- ⭐ CubeDesk or csTimer - Feature-Rich Cubing Timers
- ⭐ SpeedCubeDB - Algorithm Database
- Rubiks Cube Guide - Guide to Rubiks Cube
- F2L Trainer - F2L Rubiks Trainer
- crystalcube - CFOP Cross Trainer / Edge Orientation Trainer
- ZZ Method - Learn / Practice ZZ 3x3 Rubiks Speedrunning Method
- Roux Trainers - Learn Roux Solving Method
- SpeedSolving / Wiki or Ruwix - Cubing Wiki / Community Forum
- World Cube Association - Cubing Competitions & Records
- Cubing Time Standard - Track Your Performance Across WCA Events
- alg.cubing.net, CubeDB, or Tao Yu Trainer - Algorithm Animators / Visualizers
- F2L Trainer - Algorithm-Specific Trainers
- BlindTrainer - Blindfolded Rubinks Trainer
- Hypercubing - Hypercubing Wiki
- Speedcube.app - Cubing Timer (Mobile-Friendly)
- SolveTheCube - Cubing Timer
- qqTimer - Cubing Timer
Chess
- 🌐 Awesome Chess, TheChessDirectory or Chess Resources - Chess Resources
- 🌐 /m/Chess or r/Chess - Chess Subreddits
- 🌐 r/Chess Books - Recommended Chess Books
- ⭐ Scid vs. PC - Learn / Practice Chess
- ChessGames - Chess Database / Community
- ChessLab - Chess Lessons / Discord
- List Study - Chess Lessons
- Chessable - Chess Lessons
- TheChessWebsite - Learn / Practice Chess
- HerculesChess - Learn / Practice Chess
- Chess Tempo - Chess Practice
- Lucas Chess - Chess Practice
- Chess Coach - Chess Coaching App
- Chess OCR - Multi-Site Digital Chessboard Analysis
- WintrChess, 2 - Chess Game / Move Analysis
- Chess Analysis - Chess Game / Move Analysis / Discord
- Pawn Appétit - Chess Game / Move Analysis / GitHub
- Chesskit - Chess Game / Move Analysis / Discord / GitHub
- YottaChess - Chess Game / Move Analysis
- Chessigma - Chess Game / Move Analysis / Discord
- En Croissant - Chess Game / Move Analysis
- Chess Vision - Chess Game / Move Analysis
- OpeningTree - Download / Visualize Chess Games
- Chess Monitor - Track Chess Analytics
- 2700chess - Live Chess Player Ratings
- 365Chess - Chess History / Lessons
- ChessVariants - 1000+ Chess Variants + Guides
Dungeons & Dragons
- ⭐ D&D Compendium or RPGBOT - D&D Tools & Learning Resources
- ⭐ 5etools, DM Screen or The Acaeum - Rules & Content References
- ⭐ D&D Beyond - Official Toolset for 5E
- ⭐ Kobold+ Fight Club - Encounter Builder & Balancer
- Avrae - D&D Automation Discord Bot
- DnD-Books or D&D 5e BR / Use Translator - D&D 4E/5E Books
- Cruinne's D&D Reading Room - D&D Worldbuilding Checklist
- Tetra-cube - Monster Statblock Generator
- GM Binder - 5E Homebrew Document Editors
- D&D Wiki - D&D Homebrew Wiki
Developer Learning
- 🌐 Awesome Certificates - Dev Course Indexes
- 🌐 Awesome YouTubers - YouTube Dev Channels Indexes
- 🌐 ProgrammingLearningResources, r/LearnProgramming Wiki, Programming Learning Index, awesome-opensource-documents or A-to-Z-Resources-for-Students - Programming Learning Resources
- 🌐 Python Discord - Python Learning Resources
- 🌐 Roadmap - Developer Roadmaps / GitHub
- 🌐 Path to Senior Engineer or Professional Programming - Software Engineer Resources
- ⭐ freeCodeCamp - Programming / Courses / Interactive
- ⭐ git-cheat-sheet, Git Commands or Git Cheatsheet - Git Command Lists
- ⭐ OpenVim or Vim Hero - Interactive Vim Tutorials
- ⭐ StarSQL, SQL Practice or Learn SQL - SQL Lessons / Practice
- First Timers Only - Contribution Guide for Beginners
- Beej's Guide to Git or Git Tips - Git Guides / Tips
- Oh My Git! or Oh Shit, Git!?! - Git Learning Game
- Git Tutorial - Interactive Git Tutorial
- Learn Git Branching - Interactive Git Branching Guide
- Git Time - Git Learning Game
- Hack Club - Non-Profit High School Coding Community / Resources / GitHub
- DevToolTips - Developer Tips
- Checki0 - Code Learning Games
- Scrimba or VittaScience - Interactive Programming Learning
- CloudSkillsBoost - Programming Courses
- MOOC.fi - Programming Courses
- EggHead - Programming Courses
- TechSchool - Programming Courses / Discord
- Josh Comeau - Programming Tutorials
- Scratch / Firefox Extension / Chrome Extension / Package Projects / Javascript Converter, 2 / Wiki / Guides / GitHub or MIT App Inventor - Beginner Programming Learning
- USACO Guide - Competitive Programming Lessons
- Beej's Guides or LearnByExample - Programming Guides
- CodinGame - Games to Practice Coding / Programming
- Advent of Code - Programming Puzzles
- Project Based Learning - Collection of Project-Based Tutorials
- Interview University - Software Engineer Study Guides
- System Design 101 or system-design-primer - System Design Guides
- CLIG - CLI Design Guide / Discord
- LearnToCloud - Cloud Computing Guide
- Swift Playgrounds - Learn Swift UI / Samples
- rTorr - Vim Editor Cheat Sheets
- Vim University - Vim Tips
- VimTip - Vim Editor Tips
- Vim Adventures - Vim Learning Game
- High Assurance Rust - Software Development Guide
- LearningSEO.io or SEO Cheat Sheet - SEO Learning
- SQL PD, SQL Noir, Lost at SQL or SQL Easy - SQL Learning Games
- PostgreSQL Tutorial - PostgreSQL Tutorial
- MySQL Tutorial - MySQL Tutorial
- LearnOpenGL - Learn OpenGL
- Devops Exercises - DevOps Exercises
- 90DaysOfDevOps - Learn DevOps
- Hasura - GraphQL Courses
- systemd-by-example - systemd Learning
- The Linux Kernel - Linux Kernel Development Guides / Archives
- Workbench - Learn / Experiment with Gnome / GitHub
Coding Tutorials
- 🌐 Project Based Learning - Project Based Learning Resources
- ⭐ Build your own X - Advanced Coding Tutorials / Discord / GitHub
- Programiz, TutorialKart, Hackr.io, Ultimate Programming, GeeksforGeeks or Tpoint Tech / Telegram - General Coding Tutorials
- Guru99 - Software / Web Development
- Codelabs - Project Based Tutorials
- The SHA-256 Project - Learn to Develop SHA-256
- calmcode - Video Tutorials
- zetcode - Programming Notes / Ebooks
- Ebook Foundation - Programming Ebooks
Programming Languages
- ⭐ 30 Days Of Python - Python Programming Challenge
- Hitchhiker's Guide to Python - Python Guide / GitHub
- Typing.io or Silver Dev's WPM - Programming Typing Practice / Sign-Up
- A Byte of Python - Python Guide
- Learn Python - Interactive Python Guide
- FutureCoder - Interactive Python Guide
- Genepy - Interactive Python Guide
- Learn-Python - Python Playground / Cheatsheet
- CS50 - Python Course
- Tea Press - Python Learning Book
- Learn C - C Tutorials
- C++ Core Guidelines / GitHub or modern-cpp-tricks - C++ Tips
- Learn C++ or StudyPlan - C++ Lessons / Tutorials
- Makefile Tutorial - Makefile Tutorial
- AmigosCode, Java Design Patterns or learncs.online - Java / Kotlin Guides
- Learn Next.js - Next.js Learning Resources
- LearnGo, Tour Go or play-with-go - Learn Go Programming
- Rust Learning - Rust Learning Resources
- Poignant or Try Ruby - Learn Ruby
- Learn Perl - Learn Perl
Web Development
- 🌐 MDN or Web Dev Resources - Web Dev Learning Resources
- ⭐ Odin Project, 2 - Programming / Courses / Interactive / Discord
- ⭐ FullStackOpen - Full Stack Course / Discord
- ⭐ LandChad, 32bit or learn.sadgrl.online - Site Development Guides
- ⭐ Learn to Code HTML & CSS - HTML/CSS Course
- ⭐ PHP: The Right Way, Learn PHP or PHP Tutorial - Learn PHP
- ⭐ JavaScript.info, Patterns.dev or 30 Days Of JavaScript - JavaScript Learning Sites
- Web Dev for Beginners - Web Dev Course
- Packet.School - Interactive Networking Learning
- Awesome Network Analysis - Network Analysis Learning
- Aquent Gymnasium or CodeAnalogies - Web Dev Tutorials
- Dash - Web Dev Courses
- Web Skills, Codeguage / Discord, web.dev or Encodedna - Web Dev Guides
- Codevolution - Web Dev Video Lessons
- The Copenhagen Book - Web App Auth Guidelines
- DOM Events - Learn about DOM Events
- WebRTCForTheCurious - WebRTC Guide / GitHub
- backendlore or Design Pattern for Humans - Backend Coding Guides
- backend-challenges - Backend Challenges for Practice
- Backend Cheats - Backend Cheatsheet / Guide
- Full Stack Solana Development Guide - Examples
- STPG - Startpage Creation Guides / Discord
- Web Design in 4 Minutes or Strml - Interactive Web Design Tutorial
- WebGL and GLSL Workshop - Interactive WebGL / GLSL Tutorial
- HEAD - HTML head Element Guide
- css-animation - CSS Animation Tutorial
- 100DayCSS, CSS Challenges or PlayCSS - CSS Challenges
- Codepip, Grid Garden, CSS Battle, CSS Speedrun, CodingFantasy or CSS Diner - CSS Learning Games
- Guess CSS - CSS Guessing Game
- Flexbox Froggy, Flexbox Zombies, FlexboxDefense or KnightsoftheFlexboxTable - CSS Flexbox Learning Games
- DefensiveCSS - CSS Tips
- LearnCSSGrid or GridByExample - CSS Grid Guides
- ReactStudyKit - React Study Tools / Flashcards
- You Don't Know JS or EloquentJavaScript - JavaScript Learning Books
- JavaScript Questions or JavaScriptQuiz - JavaScript Questions for Practice
- 33 JS Concepts - Useful JavaScript Concepts
- You-Dont-Need-jQuery - JavaScript Query Style Events Guide
- Untrusted - JavaScript Learning Game
- HTMLDog - HTML/CSS and JavaScript Tutorials
- Pixactly - Test Pixel Dimension Orientation
Computer Science
- 🌐 CompSciLib - Computer Science Tools
- ⭐ TeachYourselfComputerScience - Computer Science Book Recommendations
- ⭐ Open Source Society University / PT-BR / CN - Computer Science Roadmap / Discord
- ⭐ CS50 - Harvard Computer Science Course / Subreddit / Telegram / Discord / GitHub
- ⭐ NandGame - Computer Building Puzzle
- ⭐ CraftingInterpreters - Scripting Language Implementation Book / GitHub
- CSRankings - Publication Activity of Computer Science Colleges per Topic
- CS1000 - Computer Science / Software Engineering
- Tech Dev Guide - Computer Science Google Courses
- Big-O Cheatsheet - Computer Science Complexities Cheatsheet
- CSDIY, awesome-low-level-design, awesome-system-design-resources or LearnAIFromScratch - Computer Science Learning Guides
- ProfessorMesser - IT Courses
- Code.org - Computer Science Courses
- cs-video-courses - Computer Science Courses
- Modern Computer Science Curriculum - Computer Science Courses
- CollegeComendium - Computer Science Courses
- Runestone Interactive - Interactive Guides
- Computerphile or CSDojo - Computer Science YouTube Channels
- ApressOpen - Computer Science Books
- Papers We Love - Computer Science Research Papers
- CS Academy - Interactive Computer Science Lessons
- From Nand To Tetris - Computer Building Lesson
- Copetti - In-depth Console Architecture Analysis / GitHub
- Web Browser Engineering - Learn about Browser Engineering
- OSDev Wiki - Operating System Dev Wiki
- Wi is Fi - Wi-Fi Educational Guide
- CPU Land - What Happens when you run Programs
- Computer Science Lecture Links
- Eylenburg - Hardware / Software Comparisons + History
Data Science
- 🌐 Awesome DataScience - Data Science Resources
- 🌐 Data Engineer Handbook - Data Engineer Resources
- ⭐ Open Source Society University - Data Science Roadmap / Discord
- Mage - Data Science Pipelines
- Deepnote - Data Science Notebook
- Visualization.info - Learn About Data Visualization
- 365Datascience - Data Science Courses
- Advanced R - R Guide / Solutions
- R Packages - R Packages Guide
- R for Data Science - R Data Science Guide
- Zero to Nix - Nix Learning Guide
- ggplot2: Elegant Graphics for Data Analysis - ggplot2 Guide
- Data Science Ipython Notebooks, Scipy Lectures or Virgilio / GitHub - Learn DataScience
- Data Engineering Zoomcamp - Data Engineering Course
- Data Engineering Practice Problems - Data Engineering Practice
- Learn to Make Netflix Clone
- Zasper - Data Science IDE
Data Structures
- ⭐ Leetcode - Coding Practice
- ⭐ Leetcode Tools - Solutions, 2, 3 / Company Questions, 2, 3 / Animations / Anki Cards / Videos / Resources / Analytics
- NeetCode - Coding Interview Practice
- algonds - Coding Practice
- Codility - Coding Practice
- ProjectLearn - Coding Practice
- LintCode or CodeWars - Coding Practice
- Coding Questions or Skilled.dev - Coding Interview Questions
- BuildBox, DevPost, HackTheEarth, EMKC, AtCoder or Toph.co - Hackathon / Challenge Communities
- Rosetta Code, CodeAbbey, Kattis or Coding Problems - Coding Problems / Solutions
- Exercism, HackerRank or CS Circles - Programming Lessons
- Hello Algo - Data Structures and Algorithms Course
- Algorithms-Cheatsheet-Resources - Code Algorithm Cheat Sheets
- algorithms - Code Algorithms & Data Structures Tutorials
- JavaScript Algorithms - Algorithms and Data Structures in JavaScript
- VisuAlgo - Data Structures & Algorithm Animations
- Algorithm Visualizer, Staying or Sorting Algorithms Visuallizer / GitHub - Visualize Code Algorithms
- CSES Problemset - Collection of Algorithmic Programming Problems
- Memery Spy - Learn how Bytes Represent Variables
UI / UX
- design.tips or Utopia - Design Tips
- HackDesign or Sky Design - UI / Webdesign Courses
- 50 UI Tips - UI / UX Design Book
- Can't Unsee - UI Design Test
- UXTools or UXMovement - Learn UX Design
- SitePoint - UX Design Courses & Books
- delightful humane design - Humane Design Resources
- Laws of UX - Maxims / Principles for UI Designers
- Deceptive Patterns - Deceptive User Experience Examples
- UI Coach - UI Design Challenge Generator
- HTML Dog - Frontend Tutorials & Examples
- FrontEndMentor or Frontend Challenges - Frontend Design Challenges
- Frontend Learning Kit - Frontend Learning Index
- Frontend Bootcamp - Frontend Workshop
Cybersecurity
- 🌐 Free Cyber Resources, BlueTeam Tools or Applied Cybersecurity - Cybersecurity Learning Resources
- 🌐 Official Cybersecurity YouTube Channels
- 🌐 CTF Sites, echoCTF.RED, CTF101, picoCTF, CTF Beginners Guide, CTFtime or CTFLearn - CTF Resources / Guides
- 🌐 Awesome Sites to Test On - Cybersecurity Practice Sites
- ⭐ HackTricks - Practical Penetration Testing & Security Auditing Tips
- ⭐ PortSwigger Academy - Web Security Learning
- ⭐ OWASP Cheatsheet - Application Security Guide
- Hackers101, SmashTheStack or WebHacking - Cybersecurity Challenges
- Skills for All or 90DaysOfCyberSecurity - Cybersecurity Courses
- Sectube - IT Security Event Recordings
- TryHackMe, HackTheBox or OpenSecurityTraining2 - Cybersecurity Lessons
- Addielamarr, Cyber Talent Kids or Teach Yourself Info Sec - Learn About Cybersecurity
- pwn.college - Cybersecurity Practice
- OverTheWire - Cybersecurity Learning Game
- Hacksplaining - Developer Security Lessons
- MicroCorruption - Learn Reverse Engineering / Cybersecurity
- x86re or Reverse-Engineering - Reverse Engineering Guides
- CrackMyApp or crackmes / Discord - Reverse Engineering Challenges
- Reverse Engineering Academy - Interactive Reverse Engineering Lessons
- Nightmare - Binary Exploitation Defense / Reverse Engineering Course
- John Hammond - Cybersecurity YouTube Tutorials
- Pentesting Bible or Juice Shop - Learn Pentesting
- How DNS Works - Learn DNS
- How DNSSEC Works - Learn DNSSEC
- CryptoPals or Overview of Cryptography or cryptohack - Cryptography Learning
- CrypTool - Interactive Cryptology Learning / Puzzles
- How HTTPS Works - Learn HTTPS
Game Development
- 🌐 Awesome-Gamedev, Learn Gamedev, MagicTools, Newgrounds Wiki: Game Dev Resources or The VG Resource - Learning Resources
- ⭐ Brackeys - Game Dev Tutorials
- ⭐ r/gamedev - Reddit Community
- 20 Games Challenge - Beginner Game Dev Challenges
- CodeWisp - Interactive Beginner Game Dev Learning
- Amit’s Game Programming - Game Programming Guide
- GameProgramBooks - Game Programming Books
- PICO-8 - Basic Game Dev Concepts / Web Version
- From Zero To Hero - 2D Game Dev Book
- Web Game Dev - Game Dev Guides / Discord
- SebastianLague - Game Dev Tutorials
- Level Design Book - Level Design Guide / Book
- Trig for Games - Trigonometry Lessons for Games
- Shadertoy - Real-Time Shader Dev Platform
- Game Math - Mathematics Lessons for Game Devs
- Graphics Workshop - Learn Computer Graphics
- The Book of Shaders - Fragment Shaders Guide
- EmuDev - Emulator Development Information / Discord
- EmuDevs - NES Emulator Development Learning Game
- QB64SourceCode - QB64 Game Programming Tutorials
- 8bitWorkshop - Retro Game Programming Tutorials
Exam Prep
- 🌐 IBResources - International Baccalaureate Resources
- FreeOnlineTest, CrackAP, Examveda, SaveMyExams, Aglasem, MajorTests or Alloprof - Exam Practice Tests
- IndiaBIX - Aptitude Tests
- Science Career General - PhD / STEM Career Study Guides
- DoubtNut - Exam / Solutions / Help / Ad-Bypass
- Papers.Xtreme - Test Revision Notes & Answers
- AllFreeDumps - Exam Dumps
- IELTS69 - Cambridge Practice Tests
- CaieFinder - Previous Cambridge Test Answers
- Exam Downloader - Exam Download Tool
- ITExams - IT Exam Collection
- Pearson's AP Universe - AP Exam Guides / Community / Discord
- CrackAP - Practice AP Exams
- r/APStudents Course Survey - AP Exam Comparison Spreadsheet
- r/CATpreparation - CAT Test Prep / Discord
- Revisely - GCSE Exam Help
- free-clep-prep or ModernStates - Free CLEP / DSST Exam Prep
- nzqa.toasting - Download NZQA Past Papers
- CatchaScience, IGCSEResources, r/IGCSE or ZNotes - IGCSE Study Notes / Resources
- IGCSE Papers, RevisionScience or Physics & Maths Tutor - Download Past GCSE / IGCSE Papers
- anthropology - UPSC Telegram Channel
- GaryChamberlainLectureNotes - Econometrics Lecture Notes
SAT Testing
- 🌐 Digital SAT Resources - SAT Resources
- ⭐ OnePrep - SAT Practice Exams / Questions
- SAT Slayer, 2 - SAT Practice Exams / Questions
- Mcelroy Tutoring - SAT Practice Exams / Questions
- Sat DB - SAT Practice Exams / Questions / Sign-Up Required
- DSATuz - SAT Practice Exams / Questions / Telegram
- The SAT: Practice Tests - SAT Practice Exams / Questions
- SATArchive - Previous SAT Test Archive
- SAT Reading - Suggested SAT Reading
- SAT_Files_discussion - SAT Exam Discussion
JEE / NEET
- 🌐 r/JEENEETards Index - Guides / Study Material
- ⭐ PhysicsWallah - JEE Lessons / YouTube
- ⭐ PirateHive - Guides / Study Material
- ⭐ ExamSide - PYQ Solutions
- JEE Hub - JEE / NEET PYQs
- JEE Books, JEEBooksPDF / Telegram or JEE Archive - JEE Books Archives
- Genetry or Lec.Branch - JEE Lectures
- YouTube Lengths, Fastlane Lengths or Normal Lane Lengths - Lecture Lengths / Data
- MarksAPP - Guides / Study Material / Telegram
- DoubtNut - Solutions / Help / Ad-Bypass
Educational Tools
- 🌐 nanoHUB - Nanotechnology Tools
- 🌐 5th STAAR Resource Curation - Grade School Tools
- ⭐ Excalidraw / Sharing, OpenBoard, DGM, NotebookCast, WebWhiteboard, Microsoft Whiteboard, WBO, OurBoard, Whiteboard.fi or Whiteboard Fox - Whiteboards
- FreeForStudent - Free for Student Deals
- Better Canvas - Canvas Enhancement Extension
- Tasks for Canvas - Improved Canvas To-Do List
- ImageJ / Web or Fiji - Scientific Image Analyzers
- Altium - Schematics Visualizer
- Wolfram Cloud - Computational Intelligence
- GradesFixer - Essay Samples
- Edu VPN - Institute Access VPN
- BachelorStudies - Bachelor Degree Search
- Scholarship Roar - Scholarship Database
- Extracurriculars.org / Discord, snow.day or Talem - Extracurricular Search
- Niche, TheUniGuide, Alumnius or Top Universities - University / School Comparisons
- CSRankings - Publication Activity of Computer Science Colleges per Topic
- RateMyDorm or 😃 - College Dorm Reviews
- RateMyProfessor - Professor Ratings
- Wordwall - Lesson Creator
- The Chomsky Index - Noam Chomsky Content Index Tool
- Internet-In-A-Box - Create Free Offline Learning Hotspots / GitHub
Study / Research
🌐 Awesome Research, Scolary, KausalFlow, Foam, Zotero, ResearchRabbit or Scrible - Research Tools
⭐ Wolfram Alpha or Wolfram Mobile - Searchable Knowledge Base
⭐ StudyLion - Study Tracker / Productivity Discord Bot / GitHub
⭐ StudyKit, StuDoc / Downloader, Knowt, Quizlet / Show Hidden, Shmoop, Bitesize or SparkNotes - Quizzes / Study Material
⭐ Anki / Subreddit / Discord / GitHub, StudyLib, RemNote, Flippity, Flashcard Machine, Gizmo, MemoAnki, revisiondojo, Flashka or NoteKnight - Flashcard Tools
⭐ Coursicle - Class Schedule Tracker / Android, iOS
⭐ OpenSyllabus - Syllabus Search / Info
StudyCraft - Flashcards / Markdown Notes / PDF Reader / GitHub
SciSpace, Bohrium, Scinito or Elicit / GitHub - Research Chatbots
Paper Trails - Academic Paper Tracker
mybib, citemaker, formatically, zbib, CitationMachine, BibGuru, Scribbr, CiteFast or Cite This For Me - Citation Generators / Chrome
Publish or Perish - Citation Analyzer
Inciteful - Find Connected Literature via Citations
PLText, PlagiarismDetector or Duplichecker - Plagiarism Checkers
cb2bib - Reference Extractors / Managers
MassiveMark - Convert LLM Chats to DOCX / Discord
GROBID - Extract / Organize Scientific Document Info
ExpertFile or ExpertiseFinder - Industry / Academic Expert Search
Catma - Research Markup & Analysis Tool
OpenRefine - Data Cleaning
Taguette - Data Analysis Document Tagging
General Index - Article Metadata Mining Project
Papertag - Attach Digital Content to Paper
GradesCalculator - Calculate CGPA & GPA
CalculateCGPA - Calculate GPA
LearnedEasy - Create Summaries / Quizzes from Books
SearchifyX - Search Flashcards
Brainly - Homework Help Bots / Communities / Limit Bypass
Free Numerade Videos - Homework Help Videos
MammothMemory - Visual Memory-Based Solutions
StudyStream, Yeolpumta or StudyTogether - Online Study Groups
Space Finder - UK Study Space Search
Cheatography - Educational Cheat Sheets
Calculators
- ⭐ Wolfram|Alpha - Calculators
- ⭐ Omni Calculator - Calculators
- ⭐ OpenCalc, yetCalc or microMathematics - Android Calculators
- ⭐ GeoGebra or Desmos - Graphing Calculators
- CEmu or TI 84 Calculator / 2 / 3 / 4 - TI-84 Calculators
- numbr.dev - Calculators
- Aqua Calc - Calculators
- PlanetCalc - Calculators
- MatrixCalc - Matrix Calculator
- Qalculate - Desktop Calculator
- QwikTape - Note Style Calculator
- Kalker or Numbat - Scientific Calculators
- TICalc - TI Graphing Calculator Files
- arTIfiCE - TI CE Calculator Jailbreak
- Numla - Live Calculative Notepad / GitHub
- Cymath, PhotoMath (search), Mathway, MathDF, Tiger Algebra, Maxima or Symbolab - Math / Algebra Problem Solvers
Dictionaries / Thesaurus
- ⭐ OneLook - Multi Dictionary / Thesaurus Search
- ⭐ Merriam-Webster - Dictionary / Thesaurus
- ⭐ GoldenDict / 2 - Dictionary
- ⭐ NGrams or Netspeak - Word Usage Trackers
- ⭐ The Piracy Glossary - Piracy Dictionary
- ⭐ UrbanDictionary / Frontends or Slangit - Slang Word / Phrase Dictionaries
- Wordnik - Dictionary
- Oxford English Dictionary - Dictionary / Bypass
- Cambridge Dictionary - Dictionary
- Wiktionary - Dictionary
- PowerThesaurus - Thesaurus
- Historical Thesaurus of English - Historical Thesaurus
- Phrases.org - Phrase Dictionary
- Time Traveler - Find Words First Printed Usage
- EtymOnline - Etymologies
- StarlingDB - Advanced Linguistics Dictionary
- Phrontistery - Obscure Word Dictionary
- Unionpedia, Lexipedia or VisuWords - Word Connections / Visualizers
- Eunoia - Words with No Translation
- Affixes.org - Affixes
- Fraze.it - Sentence Search
- Feeels - Emotion Synonym Chart
- PrideFlags - LGBT Flag Index
- TheDevilsDictionary - Cynical Dictionary
- WordSafety - Swear Word Indexes
- PyGlossary or DSL Converter - Convert Dictionary Files
Encyclopedias
- 🌐 List of Encyclopedias - Online Encyclopedia Index
- ⭐ Wikipedia - Encyclopedia / Content List
- ⭐ EncycloSearch or EncycloReader - Encyclopedia Search Engines
- ⭐ Wolfram Alpha - Searchable Knowledgebase
- Omniglot - Writing Systems & Languages Encyclopedia
- Simple Wiki - Simplified Wikipedia / Auto-Redirect
- Britannica
- EverybodyWiki
- Encyclopedia
- NewWorldEncyclopedia
- Citizendium
- Wikitia
- InfoPlease
- Refdesk
- HandWiki
Wikipedia Tools
- 🌐 Wiki Portals - Wiki Portals Navigation
- HatNote - Top Pages
- Reversepedia - Page Connections
- wik - Wiki TUI
- CDPedia - Offline View
- Substance - Extract Markdown
- UrlShortener - Shorten URLs
- WikiNearby - Location Search
- EntiTree - WikiData Visualization Tool / GitHub
- Wiki Timeline - Create Timelines from Wiki Articles