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A hand-picked directory of free, trustworthy sites for studying, researching, learning to code and staying well — plus our own institutions directory.
The free encyclopedia — a starting point for almost any topic.
The gold standard for citation styles and academic writing.
High-quality machine translation across many languages.
Free reference manager — collect, cite and share sources.
Search scholarly literature across disciplines.
Open-access preprints in physics, maths, CS and more.
AI-powered search and citation graphs for papers.
Visual maps of how papers relate to each other.
Free lessons from maths to economics, with practice.
Real MIT course materials, free for everyone.
University courses online; audit many for free.
Powerful spaced-repetition flashcards for any subject.
Learn to code for free, with hands-on projects.
Practice 70+ programming languages with mentoring.
Beginner-friendly web-development references.
Coding-interview practice problems.