Zorbi - Spaced-Repetition Flashcards - Other tools are built by boomers, Zorbi is built by students.
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SmartCards+ - Spaced Repetition Software for iOS. Modern, powerful and easy to use.
NameShouts - Better connections, one name at a time.
Mochi - Write notes and flashcards with Markdown and study them with spaced repetition.
Forvo for iPhone - Learn how to correctly pronounce words in over 335 languages