Tunnel
Tunnel is a game in which you control a capsule going down a tunnel, shooting other balls in the way. The game has been tested on GNU/Linux and Windows.

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Tuxedo T. Penguin: A Quest for Herring
Tux's virtual world "works" - he can walk, swim, fly, ride platforms, teleport, eat herring, throw snowballs and so on.

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XBattleAI
A realtime strategy game in it's purest form. You are fighting on a graph (map) where certain nodes continously produces energy (troops) and you fight by drawing arrows along the edges where troop movements should occur.

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