Etoys - Etoys is an educational tool for teaching children powerful ideas in compelling ways.
HoDoKu - HoDoKu is a sudoku helper written in Java and available in English and German.
GCompris - Educational Game for Children 2 to 10 years old.
Sum Fun - A fun number puzzle game for iPhone and iPad.
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.
Math Search - See posts, photos and more on Facebook.