I don't know, I haven't played UT because it looks so silly (those three mods use real-looking weapons and players).
For a while--it might still be--Counter-strike was the #1 online game. All three of those games are free, but you have to own Half-Life in order to play them.
OK rude boy... thanks for the tip. If there are other good games out there, I will check them out. I have never had a requirement that games be just like real life... But I am silly that way.