You've probably heard of it, but maybe you haven't.
Wolfenstein: Enemy Territory.
It is a FREE team based First Person Shooter set in WWII times. Allies/Axis
You can be 5 different jobs: Soldier, Medic, Field Ops, Engineer, or Covert Ops.
You gain experience and skills like in RPGs.
Fast paced, with good amounts of health (unlike realistic games like CounterStrike)
This is the server I always play in: Evil Smurfs Lair 67.18.198.243:27960
Server rules are no spawnkilling and no self kill during battles. It is a pretty good server because of the rule of no SKing, and there isn't a bunch of addons. They serve the basic 6 levels. XP Resets at 10,000 and XP Save is a month IIRC. And NO Bots!
My name is Camaro.
An easier way to log in, is to download "The All Seeing Eye" server finding software. There is a shareware version that works perfect for free.