Childsplay has a similar approach of GCompris but it’s based on the Python language and the pygame library (SDL based). It works on GNU/Linux and Windows
  The KDE Edutainment Project: high-quality educational software for the K Desktop Environment
  New Breed Software have Open Source software available for a variety of platforms, including Windows, Macintosh, Linux, Unix, BeOS, and even PDAs and video game systems!. Especially the famous tuxpaint
  Another application for the youngest, PySyCache teaches children to use the mouse.