Sum - Simple Maths Puzzle - How fast can you add two numbers?
Wikids - An encyclopedia that talks to your kids
Griddition - Griddition is a challenging numbers puzzle where you must fill a grid with numbers, Sudoku-style.
Numito - Word and number puzzles game, similar to Countdown GameShow
NumberDrop - A uniquely challenging math puzzle game.
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.