Dota 2 is an action strategy title for the PC and Mac. It is being developed by Valve Corporation, and is the stand-alone sequel to a popular mod created for WarCraft III, called Defence of the Ancients (Dota), which is itself loosely based on a custom map for the original StarCraft, called Aeon of Strife.

Black Mesa is a re-imagining of Valve Software's critically acclaimed 1998 video game Half-Life using the more advanced capabilities of the Source engine.

Counter-Strike: Global Offensive is a first-person shooting game developed by Hidden Path Entertainment and Valve Corporation for Mac OS, Microsoft Windows, PlayStation 3 and Xbox 360. It is the fourth release in the Counter-Strike series and originally a port of Counter-Strike: Source to Xbox Live Arcade, though the idea was dropped and the project evolved into a new game for multiple platforms.

Portal 2 is a first-person puzzle-platform video game developed and published by Valve Corporation. It is the sequel to Portal and was released on April 18, 2011 for Microsoft Windows, Mac OS X, PlayStation 3, and Xbox 360. The retail versions of the game are distributed by Electronic Arts, while digital distribution of the Windows and OS X versions is handled by Valve's content delivery service Steam. Portal 2 was announced on March 5, 2010, following a week-long alternate reality game based on new patches to the original game.

Alien Swarm is an action game developed by Valve Corporation and released on Microsoft Windows.

Left 4 Dead 2 is a shooter game developed by Turtle Rock Studios, Valve Corporation and released on Mac OS, Microsoft Windows, Xbox 360.

Left 4 dead is a first person shooter game, with one simple objective, survive! You and 3 others (ai or human) must fight the undead while trying to escape, make it to the safe house and youve fought to live another day. die and you join the undead and there relentless quest for brains!

Counter-Strike Online is a first-person shooter game developed by Nexon, with oversight by Valve Corporation, for the Asian gaming market on Microsoft Windows. The game focuses solely on online multiplayer modes, with new additions including Zombie Modes, Scenario Modes and Deatmatch Modes among others. Additionally, the game features female skins and new weapons.

The Void (also known as Tension) is an adventure game developed by the Ice-Pick Lodge and released for Microsoft Windows and Mac OS. It won the "Most Original Game" award at the Russian Game Developers Conference and was released in English in 2009.

Half-Life: Episode Two is a shooter game developed by Valve Corporation and released on Mac OS, Microsoft Windows.

Portal is a story-driven puzzle game, developed by Valve and released as part of The Orange Box and stand-alone for Microsoft Windows, Mac OS, Xbox 360, and PlayStation 3. A sequel, Portal 2, was released in 2011.

Team Fortress 2 is a shooter game developed by Valve Corporation and released on Microsoft Windows, PlayStation 3, Xbox 360.

Bullet Candy is a shooter game developed by R C Knight and released on Microsoft Windows.

Half-Life: Episode One is a shooter game developed by Valve Corporation and released on Mac OS, Microsoft Windows.

SiN Episodes: Emergence is a shooter game developed by Ritual Entertainment and released on Microsoft Windows.

Half-Life 2 is a shooter game developed by Valve Corporation and released on Mac OS, Microsoft Windows, PlayStation 3, Xbox.

Counter-Strike: Source is a first-person shooting game developed by Valve Corporation for Microsoft Windows and Mac OS. The game is a complete remake of the original Counter-Strike, using the Source Engine, and retains its team-based objective-oriented gameplay.

Codename: Gordon is an action game developed by NuClear Vision and released on Microsoft Windows.

Counter-Strike: Condition Zero is a first-person shooting game developed by Rogue Entertainment, Gearbox Software, Ritual Entertainment, and Turtle Rock Studios under Valve Corporation's management for Microsoft Windows and Mac OS. It is a follow-up to the Half-Life mod, Counter-Strike and features a multiplayer mode and single-player mission pack.

Counter-Strike is an online first-person shooter game developed by Valve Software for the Microsoft Windows, Mac OS, and Xbox. Originally a mod for Half-Life by Minh "Gooseman" Le and Jess Cliffe, Valve eventually began to help in its development and bough the rights to it in 2000.

Half-Life is a shooter game developed by Gearbox Software, Valve Software and released on Mac OS, Microsoft Windows, PlayStation 2.

Half-Life: Episode Three is a shooter game developed by Valve Corporation.