Plot: Action Half-Life is a mod for the first-person shooter video game Half-Life. It strives to simulate action movies, especially those directed by John Woo. Action Half-Life is the second mod in the Action series. The first was Action Quake 2 and the third was Action Unreal Tournament 2004. Wikipedia
Plot: Deathmatch Classic, also simply known as DMC, is a multiplayer mod for Half-Life. It was released as a free download with the 1.1.0.7 patch of the game on June 1, 2001, but is now charged for on the Steam store.
Plot: Zombie Panic! Source is a cooperative survival-horror Half-Life 2 first-person shooter modification. It is the sequel to the Half-Life mod Zombie Panic. Set in the middle of a zombie apocalypse, players start as a small group of survivors attempting to stay alive. Wikipedia
Plot: Fortress Forever is a multiplayer first-person shooter total conversion modification for Half-Life 2. The game is based on Team Fortress Classic, and has been created by the Fortress Forever development team. Wikipedia
Plot: NeoTokyo is a multiplayer tactical first-person shooter total conversion modification of Half-Life 2 in a futuristic cyberpunk setting, created by American developer Studio Radi-8. Wikipedia
Plot: Insurgency: Modern Infantry Combat is a total conversion mod for Valve's Source engine. Released in 2007, it's a multiplayer tactical shooter, focused on a realistic experience, compared to other titles in that period. Wikipedia
Plot: Natural Selection is a modification for the video game Half-Life. Its concept is a mixture of the first-person shooter and real-time strategy game genres. The game was created by Charlie Flayra Cleveland, who later founded the company Unknown Worlds Entertainment. Wikipedia
Plot: Dark and Light was a pay to play fantasy MMORPG developed in Reunion Island by NPCube and published by Farlan Entertainment. It was released on June 6, 2006, to largely negative reviews. Wikipedia
Plot: Half-Life 2: Deathmatch is a multiplayer first-person shooter video game developed by Valve. Released on Steam on November 30, 2004, it uses many of the assets from Half-Life 2 and its Source engine. It features new levels, optimized for multiplayer arena play, and a few new weapons. Wikipedia