Scratch
FreeMIT's visual programming environment for kids: snap code blocks together to create games, animations and stories, then share them with a community of millions of young creators. Completely free.
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Online courses and degrees from universities and companies — Stanford, Yale, Google, IBM. Most courses can be audited free (videos and readings); certificates and graded work are paid.
Flashcard platform with hundreds of millions of user-created study sets across languages, science, history and test prep, plus practice tests, matching games and learn mode. Free tier covers creating and studying sets with ads.
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