Bounty Matics - Math can be fun and Bounty Matics proves it - you play as a bounty hunter that must win duels.
Math Games - Math Games is a website which kids in Preschool through 8th grade can practice math.
DragonBox Algebra - DragonBox Algebra 5+ - The educational game that secretly teaches you algebra.
GCompris - Educational Game for Children 2 to 10 years old.
Numbily - Free Math Game - Train your brain in a easy free math game! Improve your math skills!
childsplay - Childsplay is a collection of educational activities for young children and runs on Windows, OSX, and Linux. Childsplay can be used at home, kindergartens and pre-schools.