Freshmeat page: http://freshmeat.net/projects/crossfire/
In the words of its original author Frank Tore Johansen:
"Crossfire is a multi-player graphical arcade and adventure game made for the X Window system environment. It has certain flavours from other games, especially Gauntlet and the rogue-like games (Nethack, Moria, Angband, and Ragnarok.) Any number of players can move around in their own window, finding and using items and battling monsters. They can choose to cooperate or compete in the same world."
CrossFire clients using GTK+, Java or Win32 (Windows) are also available now, so CrossFire can be played on many platforms.
This project has the following developers:
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