Counter-Strike: Condition Zero (CS:CZ) is now available for Linux players via Steam. CS:CZ is the fifth Valve title to be released for Linux and, with its release, pushes the total number of Linux games available on Steam to 80.
Launched just three weeks ago, the Steam for Linux client is available for free from the Ubuntu Software Center. More Valve titles are heading to Linux in the coming weeks and months.
Official Website: http://steamcommunity.com/linux