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há 1 ano
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há 7 anos
This site, which offers free educational materials, many of which are used for MOOCs, is well organised and a boon for the self learner. You can download books or even make up your own text book, plus there is a growing wealth of other learning aides and links to similar sites.
há 10 anos
Great site, free knowledge supporting. came to this site through http://www.khanacademy.org/
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Sobre este site
CK-12 Foundation provides a library of free online textbooks, videos, exercises, flashcards, and real world applications for over 5000 concepts from arithmetic to history
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