SmartCards+ - Spaced Repetition Software for iOS. Modern, powerful and easy to use.
Harken - Flashcard app using smart repetition to improve your memory
FlipToMind - Space repetition app to help you remember everything
Keep Everything - Light & Fast Web Archiver for iOS, OS X.
Zorbi - Spaced-Repetition Flashcards - Other tools are built by boomers, Zorbi is built by students.
WebSatchel - Copy and save web pages to your own personal archive