List of Source mods
Wikimedia list article
This is a selected list of Source engine mods (modifications), the game engine created by Valve for most of their games, including Half-Life, Team Fortress 2, and Portal, as well as licensed to third parties. This list is divided into single-player and multiplayer mods.
Single-player mods
Aperture Tag - A modification based on Portal 2 that recreates the essence of the game Tag: The Power of Paint, the inspiration for the various gels used in Portal 2. Instead of a portal gun, the player solves puzzles using a mix of these gels that they can spray onto surfaces with a tool they carry.
Black Mesa - A third-party recreation of Half-Life (1998) that was made in response to the release of Half-Life: Source (2004), a port of the original game to the Source engine. Black Mesa originally released as a free mod in September 2012, and later had a full commercial release on Steam in March 2020.
Coastline to Atmosphere - A mod set in the Half-Life 2 universe, following Gordon Freeman after the events of Half-Life 2.
Dear Esther - An experimental "ghost story" created as a research project at the University of Portsmouth; initially released as a free modification in 2008, a longer commercial version was developed and released in 2012.
Entropy: Zero - A Half-Life 2 modification developed by Breadman set before the base game's story in which a Combine Civil Protection officer, named "Bad Cop", becomes stranded in City 10.
Entropy: Zero - Uprising - A mod of Entropy: Zero developed by Employee8 and Filipad that takes place during the uprising in Half-Life 2.
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