A new version of Nexuiz has been released, taking this source port of the original Quake to version 1.5. Here's the change list:

* Many new gamemodes, new maps, new characters
* "Instant Action" button in menu
* More Advanced AI
* Redo of all the character skins (pant/shirt color like Quake1)
* Completely new menu
* Majority of sound effects redone
* Smoother netcode
* Engine optimizations

The official site has more information, and you can download this free game locally from AusGamers. There are a few local servers up so jump online to check it out.