There are hundreds of them so i cant list all of them.
My favorite though has to be the CoD series hands down, I had the best memories of any game in CoD2 with a clan. Good but hard times.

PC
Platform »
The PC (Personal Computer) is a highly configurable and upgradable gaming platform that, among home systems, sports the widest variety of control methods, largest library of games, and cutting edge graphics and sound capabilities.
Best Multiplayer shooter of all time?
Has to be the Battlefield series for me. Counter-Strike never gave me much. Half-Life 2 with mods perhaps but the BF series are the best at that.
As this is PC only, my choice would have to go to Counterstrike. Team Fortress 2 is also quite enjoyable.
a lot of mixed feelings on this im getting from most of you... but i'd probably say it has to be Battlefield 2, even tho my personal favourate is the original Delta Force 1. There isn't anything else like it out there that plays anywhere close to that game, and i feel it kinda revolutionized the tactical shooter / clan base for online shooters today in my opinion.
"Delta Force was the original pc shooter that got me into them so that is one of the best, but as for right now I think Team Fortress 2 is badass. It's really laid back and the graphics help give you that feel to the game, but that's just my opinion."Wow, Delta force: land warrior was the first online FPS ive ver played. Got me into PC FPSs too :D
I'll say Counter-Strike. Just throwing this out there, but I'm 99.9% sure it has the most custom content of any FPS.
The franchise boasts over 20 000 custom maps, thousands of custom models and skins, and many, many, many mods/gametypes.
It's also quite old now and still had (last time i checked a few days ago) over 60 000 players for one day on CS:S
The one I've played the most would probably be RTCW and RTCW:ET, followed by Quake III and CoD,UO,2,4.
I'm going to go with the Free Multiplayer game only, RTCW:ET.
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