Published at LXer:

While there are many open-source games available (just see the recent discussion about the most advanced GPL-ed FPS), most of them are based upon the ioquake3 game engine that in turn is based upon id Software's open-source id Tech 3 engine. There's also games like Nexuiz that use the DarkPlaces engine and then also Warsow that uses QFusion. There have also been projects like XreaL that seek to greatly expand upon the visual capabilities of the ioquake3 engine, but many of these projects go on without ever making it to a release stage. Today there is yet another open-source game engine in development.

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