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.

Cotrio - The most beautiful way to move your brain and imagination

Zorbi - Spaced-Repetition Flashcards - Other tools are built by boomers, Zorbi is built by students.

Akribian - Akribian turns children into Mathemagicians with their new iOS app, Count on me!

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

MathIsFun Times Table - Learn Your Multiplication Tables