GCompris
- [Unix] Distributed under the GPL. For young children, includes activities like discovering the mouse and keyboard, telling time, puzzles, memory games, and reading training.
- http://www.gcompris.net/

Tux Typing
- Typing tutor for Linux, BeOS, or Windows starring Tux the penguin. [Open Source, GPL]
- http://tuxtype.sourceforge.net/

Gear-Up
- Create virtual flash cards for DOS from study material, test yourself, and keep score.
- http://www.simtel.net/product.php?url_fb_product_page=55827

Jaw Wars
- Brush those teeth and defeat the germs before they rot and drop out. One player, simple click Shockwave game.
- http://www.sassquad.com/games/jaw_wars.htm

CRACK: Educational Software to Practice Calculating
- Provides arithmetic tasks to be solved on Windows. These tasks begin very simple and get harder.
- http://www.licht.onlinehome.de/CRACK/cracke.htm