Wolfram|Alpha
FreeComputational knowledge engine: solves equations, computes integrals, converts units, and answers factual queries across math, science, finance and everyday life. Free for standard queries; step-by-step solutions are paid.
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Gamified language learning across 40+ languages: bite-sized lessons, streaks, leagues and spaced repetition. The free tier includes the full course content with ads and limited hearts.
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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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Minimalist typing test with live WPM, accuracy and consistency stats, dozens of modes and themes, and detailed progress history. Open source, free, no account required to practice.