Valve Corporation

Valve Corporation is a private game development company founded in 1996 by former Microsoft members Gabe Newell and Mike Harrington. They are creators of Ricochet and other games on GoldSrc and |Source] engines.

List of games

 * Half-Life (1998)
 * Half-Life: Source (2004)
 * Half-Life 2 (2004)
 * Half-Life 2: Deathmatch (2004)
 * 2: Episode One Half-Life 2: Episode One (2006)
 * Half-Life 2: Episode Two (2007)
 * Half-Life 2: Episode Three (TBD)
 * Team Fortress Classic (1999)
 * Team Fortress 2 (2007)
 * Counter-Strike (2000)
 * Counter-Strike: Condition Zero (2004)
 * Counter-Strike: Source (2004)
 * Ricochet (2000)
 * Deathmatch Classic (2001)
 * Day of Defeat (2003)
 * Day of Defeat: Source (2005)
 * Portal (2007)
 * Portal 2 (2011)
 * Left 4 Dead (2008)
 * Left 4 Dead 2 (2009)
 * Alien Swarm (2010)
 * Dota 2 (TBA)