Not sure if there's a topic about this anywhere else, I didn't see one but if there is please lock this.
Quake live!
It is basically Quake 3, made by ID, but it's free and browser based with ad support in the game (though i'm yet to see one). You only need to download and install a small program and the rest is downloaded as you play, filesize is tiny really. You can play matches with friends or randomly in ranked or unranked matches and it all runs silky smooth from my experience. Has all the usual, deathmatch, team deathmatch, capture the flag, instagib matches and a few others.
Check it out.
Quake Live This post has been edited by Redux on Feb 26 2009, 12:55 AM