I'm (I suppose) tangentially part of a team that is producing a mod/fork of Xonotic)
It's just reached release 50. It has over 60 weapons. Lots of vehicles, mounted weapons,
ability to build things if you really want.
100 or so maps. Mutators, all the good stuff.
Some of my music and maps are used, which is also here on NG, which is cool.
It's 4gb large, the game. 3d and all.
Guess I'll toss a link: http://www.moddb.com/games/chaosesqueanthology