This is a copy of sRGB map but under CC BY SA license.
It is an open source multiplayer first-person shooter. It uses the id Tech 3 engine source code (which is released under the GNU General Public License v2), and fills in the blank with all new media to make a playable game.
OpenArena is licensed under the GNU GPL version 2 - data and engine. Anyone can contribute to it, if it complies with the GNU GPL.
WARNING: OpenArena contains Mature Content. I'm serious. If you don't like shooting the bloody guts and beating hearts out of voluptuous barely modest combatants then don't play it, or play without the mature pk3 file and use com_blood 0/cg_showGibs 0 (but be aware that pure servers may not agree with this).
After a short delay of only several month finally the 0.8.8 release of OpenArena arrived at Desura.
Go give it a glance and maybe set up a dedicated server to celebrate this memorable event ;-)
The 0.8.8 release features a new character model called Neko and a bunch of either reworked or completely new maps for offline single player or online multiplayer games.
Next time a new version is released, it will doubtlessly arrive a little earlier over here.