In addition to yesterday's release of Half-Life for Linux
, Counter-Strike 1.6 was added to the Steam CDR as another game that Valve Software is making natively available for Linux.
Counter-Strike 1.6 came back in 2000 and while there's Counter-Strike: Source and Counter-Strike: Global Offensive, the original CS remains an extremely popular first-person shooter.
The Linux port of Counter-Strike is currently considered beta. The Steam page for it is here
. If you didn't get the game a decade ago, you can buy it now for a couple bucks.