GCompris - Educational Game for Children 2 to 10 years old.
WeColor Zoo Edition HD - weColor is an interactive coloring book for all ages.
I Know It - "I Know It" is an online game for practicing primary-level math concepts.
Kid Pix - Kid Pix is a bitmap drawing program aimed at children.
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.
Lil' Picasso - Lil Picasso is a coloring and creativity package for children.