Exercism
exercism.org
Practice exercises in 80-odd languages with free feedback from a human mentor
Free account
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apps.ankiweb.net
Schedules flashcard reviews for the day before you would have forgotten them.
The reference implementation of spaced repetition: you grade each card as you review it, and the scheduler pushes the easy ones weeks out while the ones you fumble come back tomorrow. AnkiWeb adds a browser reviewer and free sync across devices, and there are enormous shared decks for languages, medicine and law. It is powerful and genuinely ugly — deck design and add-ons assume you will read the manual.
AltFTool does this too
If you would rather not leave the site, Flashcard Maker covers the same job here — free, no account, and it runs in your browser.
Open Flashcard MakerQuestions
Free to use, but you have to register before it will do the job. The browser side only reviews and lightly edits — real deck building means the free desktop app, and the iPhone client is a one-off paid purchase.
Yes. Anki sends your input to its own servers to process it. That is fine for public material; for anything containing personal data, use one of the on-device tools instead.
The browser side only reviews and lightly edits — real deck building means the free desktop app, and the iPhone client is a one-off paid purchase.
Alternatives
Same category or same task, ordered by how closely they overlap.
exercism.org
Practice exercises in 80-odd languages with free feedback from a human mentor
freecodecamp.org
Teaches web development by making you write code in the browser from lesson one
khanacademy.org
Explains school maths and science one short video and one exercise at a time
duolingo.com
Turns a language into five-minute daily drills you will actually keep doing
ocw.mit.edu
Publishes the real lecture notes, problem sets and exams from MIT courses
monkeytype.com
A typing test you can tune to the exact words, punctuation and length you want