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Half-Life 2

Half Life 2Half-Life 2: Updatesecond
It debuted as the successor to GoldSrc with Counter-Strike: Source in June 2004, followed shortly by Half-Life 2 in November, and has been in active development since.
The game was developed alongside Valve's Steam software and the Source engine.

Counter-Strike: Source

Counter-Strike:SourceCSS
It debuted as the successor to GoldSrc with Counter-Strike: Source in June 2004, followed shortly by Half-Life 2 in November, and has been in active development since.
Counter-Strike: Source is a remake of Counter-Strike using the Source game engine.

GoldSrc

GoldSource engineGoldSrc engine
It debuted as the successor to GoldSrc with Counter-Strike: Source in June 2004, followed shortly by Half-Life 2 in November, and has been in active development since. Source distantly originates from the GoldSrc engine, itself a heavily modified version of John Carmack's Quake engine.
GoldSrc was succeeded by the Source engine with the releases of Counter-Strike: Source and Half-Life 2 in 2004, though Valve continues to support the engine with periodic updates.

Half-Life 2: Episode One

Episode OneHalf-Life 2 Episodesone
The release of Half-Life 2: Episode One and The Orange Box both introduced new versions of the engine that could not be used to run older games or mods without the developers performing upgrades to code and, in some cases, content.
Episode One uses the same game engine, Source, as Half-Life 2.

Valve Corporation

ValveValve SoftwareValve’s
Source is a 3D video game engine developed by Valve Corporation.
All current Valve games are built on its Source engine.

Day of Defeat: Source

HDR rendering and color correction were first implemented in 2005 using Day of Defeat: Source, which required the engine's shaders to be rewritten.
It was updated from the GoldSrc engine used by its predecessor to the Source engine, and a remake of the game models.

High-dynamic-range rendering

high dynamic range renderingHDRHDR rendering
HDR rendering and color correction were first implemented in 2005 using Day of Defeat: Source, which required the engine's shaders to be rewritten.
After E3 2003, Valve Software released a demo movie of their Source engine rendering a cityscape in a high dynamic range.

Source Filmmaker

An in-process tools framework was created to support it, which also supported the initial builds of Source Filmmaker.
Source Filmmaker (abbreviated as SFM) is a video capture and editing application that works from inside the Source game engine.

The Orange Box

Orange Box Original SoundtrackOrange Box, TheThe ''Orange Box
The release of Half-Life 2: Episode One and The Orange Box both introduced new versions of the engine that could not be used to run older games or mods without the developers performing upgrades to code and, in some cases, content.
All of these games use Valve's Source engine.

Half-Life 2: Lost Coast

Lost Coast
The former, along with developer commentary tracks, were showcased in Half-Life 2: Lost Coast.
Lost Coast serves as a technology demonstration, specifically showcasing the high-dynamic-range rendering implemented in the Source engine.

Left 4 Dead

Zoeya man-made virusAI Director
Multiprocessor support was further expanded, allowing for features like split screen multiplayer, additional post-processing effects, event scripting with Squirrel, and the highly-dynamic AI Director.
The game uses Valve's proprietary Source engine, and is available for Microsoft Windows, Xbox 360 and OS X.

Team Fortress 2

Meet the Teama sequelAustralian Christmas
The first of Valve's games to support Linux was Team Fortress 2, the port released in October 2012 along with the closed beta of the Linux version of Steam.
The finished Team Fortress 2 has cartoon-like visuals influenced by the art of J. C. Leyendecker, Dean Cornwell, and Norman Rockwell, and uses Valve's Source game engine.

Dota 2

DotaDefense of the Ancients 2Dota 2 Reborn
The successor, Source 2, was officially announced in March 2015, with the first game to use it being Dota 2, which was ported over from Source later that year.
Development of Dota 2 began in 2009 when IceFrog, lead designer of the original Defense of the Ancients mod, was hired by Valve to create a modernized remake for them in the Source game engine.

Quake engine

Quake'' engineQuakeDarkPlaces
Source distantly originates from the GoldSrc engine, itself a heavily modified version of John Carmack's Quake engine.
GoldSource engine – The first engine to be created by Valve Corporation. It was used in the Half-Life series, gave rise to the Source engine.

Portal 2

its sequelLab RatP-Body
This branch later fueled the releases of Alien Swarm and Portal 2, the former released with source code outlining many of the changes made since the branch began.
The developers ran a sanity check before crafting simple levels with the Hammer Editor, Valve's level construction tool.

Alien Swarm

This branch later fueled the releases of Alien Swarm and Portal 2, the former released with source code outlining many of the changes made since the branch began.
A Source engine sequel was announced in 2005, under the title of Alien Swarm: Infested, as a Source engine sequel to the original Unreal Tournament 2004 mod.

Left 4 Dead 2

Left4Dead 2Midnight Riders
Left 4 Dead 2 (2009)
Left 4 Dead 2 builds upon cooperatively focused gameplay and Valve's proprietary Source engine, the same game engine used in the original Left 4 Dead.

Dystopia (video game)

DystopiaDystopia'' (video game)
Dystopia (2007)
Dystopia is a team-based, objective-driven, first-person shooter video game, developed as a total conversion modification on the Valve's proprietary Source engine.

Half-Life 2: Deathmatch

Half-Life 2: Deathmatch (2004)
Released on Steam on November 30, 2004, it uses many of the assets from Half-Life 2 and its Source engine.

Vampire: The Masquerade – Bloodlines

Vampire: The Masquerade – Bloodlines (2004)
Troika used Valve Corporation's Source game engine, then in development, which was being used for Valve's own Half-Life 2.

Dark Messiah of Might and Magic

Dark MessiahDark Messiah of Might and Magic: Elements
Dark Messiah of Might and Magic (2006)
Critical praise of Arkane's previous game, Arx Fatalis, gave the opportunity for them to work with Valve Corporation to develop a new title on their Source engine, and Raphaël Colantonio opted to make a sequel, Arx Fatalis 2.

The Ship (video game)

The ShipThe Ship'' (video game)
The Ship (2006)
The Ship (later retitled The Ship: Murder Party) is a first-person shooter video game developed by Outerlight using Valve Corporation's Source engine.

Vulkan (API)

VulkanVulkan APIVulkan 1.0
Valve officially announced the engine at the Game Developers Conference in March 2015, also stating that it would be free to use for developers, with support for the Vulkan graphical API.
Source 2 – In March 2015, Valve Corporation announced the Source 2 engine, the successor engine to the original Source engine, would support Vulkan.

Artifact (video game)

ArtifactArtifact'' (video game)
The engine was also used for Valve's digital collectable card game Artifact in 2018, with a version of Source 2 created for Android and iOS to support the game on those platforms.
Artifact was created using Valve's in-house Source 2 game engine, and features direct integration with the Steam Marketplace for buying and selling cards.

Zeno Clash

Zeno Clash: Ultimate Edition
Zeno Clash (2009)
It is the debut game of developer ACE Team and uses the Source engine.