GCompris - Educational Game for Children 2 to 10 years old.
Math Master - Brain Quizzes - Math Master is a free math quiz game designed for all ages!
Tux Paint - Tux Paint is a free, award-winning drawing program for children ages 3 to 12 (for example, preschool and K-6).
Math Search - See posts, photos and more on Facebook.
Etoys - Etoys is an educational tool for teaching children powerful ideas in compelling ways.
NumberDrop - A uniquely challenging math puzzle game.