Wikids - An encyclopedia that talks to your kids
MathQuiz.io - Challenge your friends in fun math quizzes.
Numito - Word and number puzzles game, similar to Countdown GameShow
Mathquizily - Personalized math tests
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.
Afilm - An app to help you keep track of your analog shots