Category
Educational
Learn anything for free. Courses, lectures, references, and the internet's best teachers.
Courses & Learning
- Khan Academy—World-class education on everything from maths to history. Completely free.Recommended
- MIT OpenCourseWare—Full MIT course materials — lectures, notes, and problem sets — all free.
- Coursera—University-level courses from top institutions. Many free to audit.
- Brilliant—Maths, science, and CS taught through problem-solving. Interactive and addictive.
Reference & Research
- Wolfram Alpha—Computational knowledge engine. Ask it anything mathematical or scientific.Recommended
- Google Scholar—Search academic papers and citations. Better starting point than regular Google.
- JSTOR—Academic journal archive. Free access to thousands of papers after registration.
- Stanford Encyclopedia of Philosophy—The definitive, peer-reviewed resource for any philosophical topic.
- TED—Short talks on every subject imaginable. Most are genuinely worth your time.
- 3Blue1Brown—Visual maths explanations that make even complex topics click. Exceptional quality.Recommended
Skill-Based Learning
- Typing.com—Learn to touch type properly for free. One of the most underrated productivity skills.Hidden Gem
- Duolingo—Learn a language in short daily sessions. Genuinely effective for building foundations.
- Chess.com—Learn and play chess with lessons, puzzles, and games. Millions of daily players.
- RegExr—Learn and test regular expressions interactively. Invaluable for anyone who codes.Hidden Gem
Mind-Expanding
- LessWrong—A community dedicated to improving reasoning and decision-making. Dense but rewarding.Hidden Gem
- Edge.org—Annual questions answered by the world's leading thinkers. Genuinely mind-expanding.Hidden Gem
- The Marginalian—Maria Popova's long-running essays on art, science, and the human condition.
- Nicky Case—Interactive essays on game theory, systems thinking, and behaviour. Unlike anything else online.Hidden Gem
Science & Nature
- Science Daily—Latest scientific research summarised accessibly. Updated daily across every field.
- PNAS—Proceedings of the National Academy of Sciences — peer-reviewed research, open access.
- The Physics Classroom—Free, well-structured physics tutorials from basics to advanced. Underrated resource.Hidden Gem
- Numberphile—Videos making maths genuinely fascinating. Addictive in the best possible way.Hidden Gem
History & Society
- History.com—In-depth articles on historical events, people, and eras. Solid reference resource.
- The History of Rome—Mike Duncan's legendary podcast on Roman history. 179 episodes of exceptional quality.Hidden Gem
- Our World in Data—Data-driven research on global issues — poverty, health, climate. Makes the world legible.Hidden Gem
- Gapminder—Hans Rosling's interactive data tools showing how the world has changed. Perspective-altering.Hidden Gem
Languages & Linguistics
- Memrise—Language learning using real native speaker video clips. Feels more authentic than Duolingo.
- Clozemaster—Vocabulary in context using fill-in-the-blank sentences from real sources. Great for intermediate learners.Hidden Gem
- Forvo—Hear any word pronounced by native speakers from around the world. Every language covered.Hidden Gem
Maths & Logic
- Desmos—Free, beautiful graphing calculator that runs in your browser. Better than any physical one.Hidden Gem
- GeoGebra—Interactive maths tools for geometry, algebra, and calculus. Used by teachers worldwide.
- Brilliant Wiki—Brilliant's free wiki covers hundreds of maths and science topics with worked examples.Hidden Gem
Philosophy & Ethics
- Philosophy Bro—Famous philosophical texts explained in plain, often hilarious language.Hidden Gem
- Internet Encyclopedia of Philosophy—Peer-reviewed philosophy encyclopedia. More approachable than Stanford's SEP.Hidden Gem
University & Academia
- MIT OCW Courses—Every MIT course ever published online. Lectures, problem sets, exams — all free.Hidden Gem
- Yale Open Courses—Full Yale undergraduate lectures on philosophy, history, physics, and more.Hidden Gem
- NPTEL—India's top engineering and science courses from IIT professors. Remarkably good.Hidden Gem
- edX—University courses from MIT, Harvard, and 140+ institutions. Many free to audit.
- FutureLearn—UK-focused online learning platform with strong humanities courses.
Critical Thinking & Debate
- Debate.org—Structured debates on every topic. Great for practising argumentation.Hidden Gem
- Logically Fallacious—Learn every logical fallacy with examples. Essential for better thinking.Hidden Gem
- Skeptic Magazine—Evidence-based magazine on pseudoscience, conspiracy theories, and critical thinking.Hidden Gem
- Philosophy Experiments—Interactive thought experiments and philosophical puzzles. Genuinely engaging.Hidden Gem
Coding & Tech Education
- freeCodeCamp—Learn to code entirely for free. Full curriculum from HTML to machine learning.
- The Odin Project—Full-stack web development curriculum, completely free and open source.Hidden Gem
- CS50—Harvard's intro to computer science. Widely considered the best CS course online.Hidden Gem
- Codecademy—Interactive coding lessons across 14 programming languages.
- LeetCode—Coding challenges used by every major tech company for interviews.