Wolfpack is an open source server implementing the protocol used by the massive multiplayer online game Ultima Online. It aims for full support of the Ultima Online protocol and tries to mimic the same gameplay as the original.
CrystalNight is a web-based CGI game engine for a genre of game best described as "breeding" game. Meaning you, breed/train monsters/animals/etc. This is a game engine so the specifics for any game using it would need to be defined in the database.
Humans vs. Zombies is a game of moderated tag. A group of human players attempts to survive a zombie outbreak by not being tagged by zombie players. See humansvszombies.com for more. The HVZ program is a Django application that administrates this game.
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