Harken - Flashcard app using smart repetition to improve your memory

memordo - Spaced repetition tool to help you retain more knowledge

MemoStack - MemoStack is a flashcard software that help you memorize more things with less effort. It works great for test preparation, language learning, and more.

SmartCards+ - Spaced Repetition Software for iOS. Modern, powerful and easy to use.

Locked.app - Do you often forget if you've done something important?I keep coming back to check if I've locked the doors.You can check the toggle when you close the door or something.

Brainscape - Find, create, and study SMART FLASHCARDS on any device. DOUBLE your learning speed using the most effective study system on the planet. Keep all your content in sync across Brainscape's website and your Android devices.