GCompris - Educational Game for Children 2 to 10 years old.
I Know It - "I Know It" is an online game for practicing primary-level math concepts.
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.
Numbily - Free Math Game - Train your brain in a easy free math game! Improve your math skills!
Scheduled tasks - GNOME GUI for configuring a users' cron (automatic jobs). Some of its features are:
NumberDrop - A uniquely challenging math puzzle game.