Free & Open Source Games Made with id Tech

11 free, open-source games made with id Tech — real clones and remakes you can download, inspect the source of, and modify.

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Sporadic

3DGE

Clone of Doom

3DGE is an advanced OpenGL source port built on the id Tech 1 engine, aimed at modders wanting an easy platform for new content.

Platforms:WindowsLinuxOSX

Stars82

Updated10 months ago

LicenseGPL2*

Release2015

Genre: FPS

Theme: Sci-Fi

Sporadic

FTE QuakeWorld

Clone of Hexen II

FTEQW is an advanced, portable open-source engine for idTech games like Quake, Quake II, and III, with servers holding hundreds of players.

Platforms:WindowsLinux

Stars341

Updated3 months ago

LicenseGPL-2.0

Release2021

Genre: FPS

Theme: Ancient History

Active

Quadrilateral Cowboy

Clone of Quadrilateral Cowboy

Blendo Games' official GPL source release for Quadrilateral Cowboy, a first-person cyberpunk hacking adventure built on idTech4.

Platforms:Windows

Stars331

Updated1 month ago

LicenseGPL-3.0

Release2020

Genre: Adventure

Theme: Cyberpunk

Sporadic

FreeHL

Clone of Half-Life

A QuakeC reimplementation of Half-Life via the Nuclide SDK on the FTE Engine, semi-playable across Windows, macOS, and Linux.

Platforms:WindowsLinuxOSX

Stars320

Updated10 months ago

LicenseISC

Release2021

Genre: FPS

Theme: Sci-Fi

Sporadic

FreeCS

Clone of Counter-Strike

A reimplementation on the FTEQW engine and Nuclide SDK that lets players run the original Half-Life mod Counter-Strike 1.5.

Platforms:WindowsLinuxOSX

Stars300

Updated11 months ago

LicenseISC

Release2021

Genre: FPS

Theme: —

Sporadic

Skin Deep

Clone of Skin Deep

Official released source code for Skin Deep, a 2025 immersive-sim FPS built on id Tech 4, the Doom 3 engine.

Platforms:Windows

Stars189

Updated7 months ago

LicenseGPL-3.0

Release2025

Genre: FPS

Theme: Sci-Fi

Active

Thirty Flights of Loving

Clone of Thirty Flights of Loving

The official GPL-licensed source code for Brendon Chung's 2012 adventure game Thirty Flights of Loving, minus its game assets.

Platforms:WindowsLinuxOSX

Stars116

Updated3 months ago

LicenseUnknown

Release2020

Genre: Adventure

Theme: Fantasy

Active

No preview

Yamagi Quake II Remaster

Clone of Quake 2

An experimental Yamagi Quake II fork adding Nightdive's Quake II remaster support and other id Tech-era game formats.

Platforms:WindowsLinuxOSX

Stars113

Updated11 days ago

LicenseUnknown

Release2023

Genre: FPS

Theme: Sci-Fi

Active

EDGE-Classic

Clone of Doom

A Doom source port reviving the older EDGE 1.35 engine with modern visuals, easy modding, and support for Heretic and other IWADs.

Platforms:Windows

Stars101

Updated25 days ago

LicenseGPL-3.0

Release2021

Genre: FPS

Theme: Sci-Fi

Halted

Gravity Bone

Clone of Gravity Bone

The GPL-licensed source code for Brendon Chung's Gravity Bone (2008), built on the Quake II engine; art and audio assets aren't included.

Platforms:Windows

Stars91

Updated6 years ago

LicenseGPL-2.0

Release2020

Genre: Adventure

Theme: Espionage

Halted

No preview

OpenWolf

Clone of Wolfenstein: Enemy Territory

A hobby fork of the ET:XreaL id Tech 3 engine for Wolfenstein: Enemy Territory, adding bug fixes and updates.

Platforms:WindowsLinuxOSX

Stars27

Updated1 year ago

LicenseGPL-3.0

Release2020

Genre: FPS

Theme: World War II

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