Quake2
Telefragged
Quake.com
My personal favorite - PlanetQuake
All hail John Romero - right here at id Software.com
Total Annihilation
Annihilated.com
Ta.Voyager.Cs
Cavedog's own Total Annihilation.com
AnnihilationCenter
MeccaWorld
Red Alert
Westwood
Will add more later- Cobra