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memordo - Spaced repetition tool to help you retain more knowledge
Duolingo - Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.
SmartCards+ - Spaced Repetition Software for iOS. Modern, powerful and easy to use.
Zorbi - Spaced-Repetition Flashcards - Other tools are built by boomers, Zorbi is built by students.
Harken - Flashcard app using smart repetition to improve your memory
Yak Tack - remember. words.