UT:XMP - if you're familar with the XMP multiplayer game from Unreal 2, this is a new version of it on the UT2004 engine. SAS: Into the Lion's Den - shameless plug :P Based on the British special forces group the SAS this is another counter-terrorist vs terrorist mod with several gametypes. A blend of action/realism on the gameplay side. The General section of their forum is the best place to get updates on the mod and release links. The next version will be adding more weapons and gametypes. Another counter-terrorists vs terrorist type game. Strike Force - based on the UT version of Strike Force this one is now in the hands of the fan community who are working on the next verison after the original SF team screwed it up badly. Gameplay is shifting to more realism with the inclusion of iron sights in the next update. The new version should be out some time soon with major changes to just about everything. Troopers - Star Wars based FPS with Rebel and Imperial teams. Gameplay is more action oriented than realism. Counter terrorists vs terrorists with hostages, bomb defusal etc.

Tactical Ops Crossfire - if you recall the UT version of Tac Ops this is pretty much the latest version of the game on the UT2004 engine with some differences. If you don't mind very small communities or having to schedule times to play then you should be in for a good time.

Some only had a small audience for a few months before dying off after their first release or their fanbases are growing smaller day by day. There's plenty of good ones out there, the problem is that there aren't many people playing them.

Killing floor alien mod