I would like to propose Frozen Bubble.


Languages: En
Compatibility: Tested on Windows XP (not sure about any thing else, no compatability information found)
License: GPLv2
Original Author's description (for v2.x):

http://www.frozen-bubble.org/ wrote:Colorful 3D rendered penguin animations, 100 levels of 1p game, hours and hours of 2p game, nights and nights of 2p/3p/4p/5p game over LAN or Internet, a level-editor, 3 professional quality digital soundtracks, 15 stereo sound effects, 8 unique graphical transition effects, 8 unique logo eye-candies.

More than ever, you really need this game.

Advantages: It is a fun, addicting, and open source game.

websites
Frozen Bubble: http://www.frozen-bubble.org/
Frozen Bubble for Windows: http://fb-win32.sourceforge.net/

Currently only Version 1.0.0 has a Windows port, a 2.x port would be nice.