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memordo - Spaced repetition tool to help you retain more knowledge
Zorbi - Spaced-Repetition Flashcards - Other tools are built by boomers, Zorbi is built by students.
SmartCards+ - Spaced Repetition Software for iOS. Modern, powerful and easy to use.
Mochi - Write notes and flashcards with Markdown and study them with spaced repetition.
Harken - Flashcard app using smart repetition to improve your memory
Yak Tack - remember. words.