The non-commercial mods can be downloaded for free, as they are not licensing the engine. made from scratch, only using the existing engine, models, sounds, textures, etc.
Some of these mods include minor or major alterations to the original game, others consist in a total conversion, i.e. Some mods are also based on cut content, featured in the released files for Half-Life, and in the leaked files for Half-Life 2. However some mods such as Garry's Mod having been turned into commercial games remain independent. Some original mods, such as Counter-Strike, Team Fortress, Day of Defeat, Ricochet, The Ship and Alien Swarm (originally a mod for Unreal Tournament 2004) have been 'adopted' by Valve and made into commercial games. The Half-Life series spawned countless mods, among which many that became highly popular in the Half-Life gaming community. HD Alyx based on Brazilian model Adriana Lima in FakeFactory's Cinematic Mod, Version 8. In-game screenshot of Black Mesa, a total conversion of Half-Life to the Source engine. In-game screenshot of Sven Co-op, one of the oldest Half-Life mods to be still in development.
An in-game screenshot from Cry Of Fear, one of the newest released Half-Life Mods from 2012.
