Khan Academy
Free, structured courses from arithmetic to art history, with practice that adapts to you.
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- khanacademy.org
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Class Central
A search engine for online courses across every university and platform, with reviews and a list of the ones that are actually free.
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MIT OpenCourseWare
Lecture notes, problem sets, exams and videos from thousands of real MIT courses, free to everyone and openly licensed.
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Math is Fun
Plain-language, illustrated explanations of maths from counting to calculus, with puzzles and little interactive tools. Still the clearest on the web.
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GeoGebra
Free dynamic mathematics software for geometry, algebra, statistics and calculus, all in-browser.
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Skill-Lync Resources
Free mini courses on engineering topics like finite elements and fluid dynamics, with interactive diagrams instead of walls of formulas.
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