We’re proud to announce that Quake Live is now available as a Free to Play game on Steam. We’ve seen an explosion of new players on the servers in the past couple of days, and are thrilled a whole new audience is now able to experience the joy of fast arena shooters. We don’t have much else to say on the matter, besides hop in and check out all the game types through the Team Combat and Variety Pack playlists!
Existing players can use the Steam version by visiting the store page. Porting your existing account over is a one way process; after linking your account to Steam you will not be able to use the old standalone launcher.
Source:: Quake Live