Template:Source branches
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This template contains list of 
Source engine branches, including third-party branches (using {{{show}}} parameters set to thirdparty).
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Valve
| Release date | Title | Developer | Platforms | Notes |
|---|---|---|---|---|
| 7 Oct 2004 |  Source 2004 |
Valve Corporation | PC: Windows | First released with Counter-Strike: Source, later used by Half-Life 2, Half-Life: Source. Later received HDR update in 2005 with the release of Half-Life 2: Lost Coast. |
| 1 Jun 2006 |  Source 2006 |
Valve Corporation | PC: Windows | Released with the release of Half-Life 2: Episode One, all previous Valve games using Source 2004 were upgraded to this branch. See Features section for the list of changes and new features. |
| 10 Oct 2007 |  Source 2007 |
Valve Corporation | PC: Windows Consoles: Xbox 360, PlayStation 3 |
Also known as "The Orange Box engine branch". Released with the release of The Orange Box (Half-Life 2: Episode Two, Team Fortress 2 and Portal). Half-Life 2 and Half-Life 2: Episode One was also ported to this engine branch exclusively on consoles (Xbox 360, PlayStation 3). See Features section for the list of changes and new features. |
| 17 Nov 2008 |  Left 4 Dead engine branch |
Valve Corporation | PC: Windows, macOS (2010) Consoles: Xbox 360 |
Released in 2008 with the release of Left 4 Dead, and later updated for Left 4 Dead 2 in 2009. Runs on newer version of Source, which does not requires Half-Life 2 base content to run. Game files from this branch were stored into VPK files, as opposed to GCF. See Features section for the list of changes and new features. |
| 3 Jun 2009 [confirm] |
 Source 2009 Source Multiplayer |
Valve Corporation | PC: Windows, macOS (2010) | Released in 2009 with an update to Day of Defeat: Source, and later Team Fortress 2. All Source 2006 games (except Half-Life: Source and Half-Life Deathmatch: Source) were upgraded to this branch with the release of Mac update in May 26, 2010 (Half-Life 2 and it's episodes), and later on Windows in June 10, 2010, alongside Counter-Strike: Source update which features many new changes from Hidden Path Entertainment. |
| 19 Jul 2010 |  Alien Swarm engine branch |
Valve Corporation | PC: Windows | Released in 2010 with the release of Alien Swarm, a remake of the Unreal Tournament 2004 mod with the same name. This is the only post-Orange Box engine branch with it's source code publicly available for free. |
| 18 Apr 2011 |  Portal 2 engine branch |
Valve Corporation | PC: Windows, macOS, Linux (2014) Consoles: Xbox 360, PlayStation 3, Nintendo Switch (2022) |
Released in 2011 with the release of Portal 2. |
| 21 Aug 2012 |  CS:GO engine branch |
Valve Corporation | PC: Windows, macOS, Linux (2014) Consoles: Xbox 360, PlayStation 3 |
Released in 2012 with the release of Counter-Strike: Global Offensive, featuring many changes not available with previous branches. This engine branch was later made obsolete with the release of Counter-Strike 2, which is the port of CS:GO to the Source 2 engine, which also adds new gameplay features and remake several maps. |
| 7 May 2013 |  Source 2013 Singleplayer Source 2013 Multiplayer |
Valve Corporation | PC: Windows, macOS, Linux Mobile: Android (Nvidia Shield) Consoles: Nintendo Switch |
Released in 2013, during the transition to the new content distribution system called SteamPipe. All remaining Source 2006 games (Half-Life: Source and Half-Life Deathmatch: Source) and all Source 2009 (including Source Multiplayer sub-branch) were upgraded to this branch. Source SDK Launcher has been deprecated on this branch in favor of launching tools (Hammer, Model Viewer, etc.) through .bat files, located in  game name\bin. Aside from that, the SteamPipe update infamously broke tons of old Source engine mods (and even Half-Life: Source), requiring manual fix or unoffical patch in order for it to function correctly. |
| 9 Jul 2013 |  Dota 2 engine branch |
Valve Corporation | PC: Windows, macOS, Linux | Released in 2013 with the release of Dota 2, and the last official Source engine branch. This engine branch was later made obsolete with the release of Dota 2 Reborn update, completely upgraded to the new Source 2 engine. |
| Release date | Title | Developer | Platforms | Notes |
Third-party
| Release date | Title | Developer | Platforms | Notes |
|---|---|---|---|---|
| 11 Mar 2014 |  Titanfall engine branch |
 Respawn Entertainment |
PC: Windows Consoles: Xbox 360, Xbox One, Xbox Series X/S, PlayStation 4, PlayStation 5, Nintendo Switch |
Released in 2014 with the release of Titanfall, and later modified further starting with Titanfall 2 and Apex Legends. Runs on heavily modified version of the Source engine, forked from Portal 2 engine branch. |
| 6 Mar 2020 5 May 2015 (early access) |
 Xengine |
Crowbar Collective | PC: Windows, Linux | Forked from Source 2013 Multiplayer, with additions from Team Fortress 2. The engine is also hybrid of Portal 2 engine branch and Left 4 Dead engine branch. It featured completely new lighting systems (CSM, Deferred lighting), and many other features listed here. |
| 7 Jan 2024 |  Strata Source |
Strata Source (formerly Chaos) | PC: Windows, Linux | Strata is a modified version of the CS:GO engine branch that combines the features of both Counter-Strike: Global Offensive and the Portal 2 engine branch, along with many improvements that bring Source close to modern standards. |
| Release date | Title | Developer | Platforms | Notes |
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