The full multiplayer component of F.E.A.R. (First Encounter Assault Recon) has been released, and for free! A notable time when a game released an online only version for free before was Wolfenstien: Enemy-Territory, which still holds a huge online community and is still free. Hopefully F.E.A.R. will have team gametypes in multiplayer and be a huge success too. I can’t wait to try it out and see if multiplayer has slow motion. 
For more info on it check the website: http://joinfear.com/main