Free & Open Source FPS Games

300 free, open-source fps games — real clones and remakes you can download, inspect the source of, and modify. Not just free to play: the code itself is open.

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TurokEX

Clone of Turok

Platforms:None

Stars48

Updated12 years ago

LicenseGPL2*

Release2012

Genre: FPS

Theme: —

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RAD

Clone of Radix: Beyond the Void

RAD is a from-scratch engine recreation of the 1995 DOS shooter Radix: Beyond the Void with OpenGL rendering.

Platforms:Windows

Stars44

Updated1 year ago

LicenseGPL-2.0

Release2020

Genre: FPS

Theme: Sci-Fi

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The Catacomb Apocalypse

Clone of Catacomb 3-D

This is the original source code for The Catacomb Apocalypse, GPLv2-licensed; game data must be acquired separately to run it.

Platforms:DOS

Stars42

Updated12 years ago

LicenseGPL-2.0

Release2014

Genre: Action

Theme: Fantasy

Active

Alien Arena

Clone of Quake 3

A free arena FPS with a macabre sci-fi theme and 23 levels; its engine is GPL-licensed and actively developed for Linux and Windows.

Platforms:WindowsLinux

Stars40

Updated15 days ago

LicenseUnknown

Release2023

Genre: FPS

Theme: Sci-Fi

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Aliens vs. Predator Gold

Clone of Aliens Versus Predator

The released Windows source for Aliens versus Predator Gold, mirrored from a 2008 GameFront download; development here has halted.

Platforms:Windows

Stars39

Updated14 years ago

LicenseUnknown

Release2012

Genre: FPS

Theme: Sci-Fi

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Rott94

Clone of Rise of the Triad

An Android source port of the 1994/95 DOS shooter Rise of the Triad, with touch controls.

Platforms:Android

Stars39

Updated13 days ago

LicenseGPL-2.0

Release2014

Genre: FPS

Theme: —

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LinWarrior

Clone of MechWarrior

Platforms:WindowsLinux

Stars38

Updated3 years ago

LicenseApache-2.0

Release2012

Genre: Simulation

Theme: Sci-Fi

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The Catacomb Armageddon

Clone of Catacomb 3-D

The original GPLv2 source for The Catacomb Armageddon, built for Borland C++, with game data requiring separate legal acquisition.

Platforms:DOS

Stars37

Updated12 years ago

LicenseGPL-2.0

Release2014

Genre: Action

Theme: Fantasy

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xGreed

Clone of In Pursuit of Greed

A Windows source port of the 1995 DOS shooter In Pursuit of Greed, adding mouse-look and higher resolution.

Platforms:Windows

Stars37

Updated4 years ago

LicenseUnknown

Release2020

Genre: FPS

Theme: Sci-Fi

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NOAH3D

Clone of Super 3D Noah's Ark

The source code of Wisdom Tree's unlicensed SNES game Super Noah's Ark 3D.

Platforms:DOS

Stars36

Updated7 years ago

LicenseUnknown

Release2018

Genre: FPS

Theme: —

Sporadic

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D3es

Clone of Doom 3

d3es adds multithreading and custom-framebuffer rendering to dhewm3, a GPL Doom 3 source port, requiring an owned copy of the game data.

Platforms:WindowsLinuxOSX

Stars33

Updated5 months ago

LicenseGPL-3.0

Release2019

Genre: FPS

Theme: Sci-Fi

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Escape from Monster Manor

Clone of Escape from Monster Manor

The official source-code release of Escape from Monster Manor, a 1993 3DO game, though only the engine code is included, not assets.

Platforms:3DO

Stars32

Updated3 years ago

LicenseMIT

Release2022

Genre: FPS

Theme: Horror

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Elite Reinforce

Clone of Star Trek: Voyager – Elite Force

Elite Reinforce is a source port of Star Trek: Voyager – Elite Force's singleplayer campaign, focused on bugfixes and speedrunning.

Platforms:Windows

Stars31

Updated1 year ago

LicenseUnknown

Release2017

Genre: FPS

Theme: Sci-Fi

Sporadic

Doom 64 for Dreamcast

Clone of Doom 64

This is a from-scratch Dreamcast port of Doom 64, built on KallistiOS and requiring the original game's data to run.

Platforms:Dreamcast

Stars29

Updated4 months ago

LicenseUnknown

Release2024

Genre: FPS

Theme: Sci-Fi

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doom64DS

Clone of Doom 64

Platforms:DS

Stars29

Updated12 years ago

LicenseUnknown

Release2013

Genre: FPS

Theme: Sci-Fi

Sporadic

JonoF's Witchaven Port

Clone of Witchaven

This is a source port of Witchaven built on the author's own Build engine port, targeting multiple platforms, though currently unplayable.

Platforms:WindowsOSX

Stars28

Updated8 months ago

LicenseUnknown

Release2021

Genre: FPS

Theme: Medieval

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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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Shadow Warrior

Clone of Shadow Warrior

3D Realms' official 2005 GPL source release of Shadow Warrior v1.2, the 1997 Build-engine shooter.

Platforms:DOS

Stars26

Updated12 years ago

LicenseUnknown

Release2014

Genre: FPS

Theme: —

Sporadic

Ken's Labyrinth enhanced port for Switch

Clone of Ken's Labyrinth

A port of Ken's Labyrinth to modern Windows, macOS, Linux, and Switch homebrew, using OpenGL and SDL2 in place of the original DOS renderer.

Platforms:Switch

Stars24

Updated4 months ago

LicenseUnknown

Release2018

Genre: FPS

Theme: —

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DarkMatter Engine

Clone of Quake 3

A Quake III engine project built on Quake3e, unifying classic Quake maps and mods with widescreen UI support; development has halted.

Platforms:Windows

Stars23

Updated5 years ago

LicenseGPL-2.0

Release2021

Genre: FPS

Theme: Sci-Fi

Sporadic

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RZDoom

Clone of Doom

A cross-platform, modernized ZDoom fork for Doom, fully wad/mod-compatible, using FMOD Studio audio and software rendering.

Platforms:WindowsLinuxOSX

Stars23

Updated7 months ago

LicenseGPL-2.0

Release2024

Genre: FPS

Theme: Sci-Fi

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MBF-SNM

Clone of Doom

A modification of the MBF Doom source port that adds the fan-made Sigil and Sigil II episodes, targeting DOS.

Platforms:DOS

Stars22

Updated2 years ago

LicenseGPL-2.0

Release2019

Genre: FPS

Theme: Sci-Fi

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Berserker@Quake2 Engine

Clone of Quake 2

A port of the Berserker@Quake2 engine to SDL2 for Linux and Windows, requiring the player's own Quake II game data; no longer developed.

Platforms:WindowsLinux

Stars21

Updated5 years ago

LicenseGPL-2.0

Release2016

Genre: FPS

Theme: Sci-Fi

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Chocolate Blood

Clone of Blood

Platforms:None

Stars20

Updated1 year ago

LicenseUnknown

Release2025

Genre: FPS

Theme: —

Active

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Chocolate DOOM-3-BFG

Clone of Doom 3

A source port reproducing vanilla Doom 3: BFG Edition on the modernized BFG engine, forked from RBDOOM-3-BFG before shadow mapping.

Platforms:WindowsLinux

Stars20

Updated1 month ago

LicenseGPL-3.0

Release2025

Genre: FPS

Theme: Sci-Fi

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MacWolfSDL

Clone of Wolfenstein 3D

A modern SDL3 source port of the Macintosh version of Wolfenstein 3D for Windows, Linux, and macOS, supporting custom scenario packs.

Platforms:WindowsLinuxOSX

Stars20

Updated1 year ago

LicenseUnknown

Release2025

Genre: FPS

Theme: —

Active

RPG-X

Clone of Star Trek: Voyager – Elite Force

A modified Quake III-based engine build for the Elite Force mod RPG-X2, with raised engine limits.

Platforms:WindowsLinuxOSX

Stars19

Updated3 months ago

LicenseGPL-2.0

Release2011

Genre: FPS

Theme: Sci-Fi

Active

Wolf3dX

Clone of Wolfenstein 3D

An open-source MonoGame reimplementation of Wolfenstein 3D for Windows and Linux, compatible with the shareware game data.

Platforms:WindowsLinux

Stars18

Updated16 days ago

LicenseGPL-2.0

Release2020

Genre: FPS

Theme: —

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Duke64-RE

Clone of Duke Nukem 3D

Platforms:N64

Stars17

Updated1 year ago

LicenseUnknown

Release2025

Genre: FPS

Theme: —

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Jedi Academy

Clone of Star Wars Jedi Knight: Jedi Academy

Raven Software and Activision's official 2003 GPLv2 source code release of Star Wars Jedi Knight: Jedi Academy, not a third-party remake.

Platforms:Windows

Stars17

Updated13 years ago

LicenseGPL-2.0

Release2013

Genre: Fighting

Theme: Fantasy

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SWP

Clone of Shadow Warrior

A Shadow Warrior source port built on JFShadowWarrior, requiring the original game's data files.

Platforms:Windows

Stars17

Updated7 years ago

LicenseUnknown

Release2013

Genre: FPS

Theme: —

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Blake Stone: Planet Strike

Clone of Blake Stone: Planet Strike

A 2013 public release of Blake Stone: Planet Strike's source code by its original publisher; needs the commercial data files to run.

Platforms:DOS

Stars16

Updated13 years ago

LicenseUnknown

Release2013

Genre: FPS

Theme: Sci-Fi

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DCDoom

Clone of Doom

Targets Sega Dreamcast, though its README is actually the original 1998 WinDoom documentation, not Dreamcast-specific notes.

Platforms:Dreamcast

Stars16

Updated4 years ago

LicenseUnknown

Release2022

Genre: FPS

Theme: Sci-Fi

Sporadic

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Daikatana Restoration Project

Clone of Daikatana

Daikatana Restoration Project aims for a clean, compilable Daikatana 1.2 source release for modern systems, currently focused on Linux.

Platforms:WindowsLinux

Stars16

Updated8 months ago

LicenseUnknown

Release2022

Genre: FPS

Theme: —

Sporadic

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Lilium Arena Classic

Clone of Quake 3

An open-source engine reimplementation of Quake 3 versions 1.09-1.16n, built on ioquake3/ioEF, targeting Linux and macOS.

Platforms:LinuxOSX

Stars16

Updated4 months ago

LicenseGPL-2.0

Release2021

Genre: FPS

Theme: Sci-Fi

Sporadic

HHexen

Clone of Hexen

HHexen is a source port of Hexen from the Hammer of Thyrion team, requiring the player's own WAD data and supporting OpenGL rendering.

Platforms:Linux

Stars15

Updated10 months ago

LicenseGPL-2.0

Release2019

Genre: FPS

Theme: Fantasy

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Kathodos

Clone of Descent

A Python/Panda3D remake of Descent aiming for the same spirit rather than an exact clone; currently unplayable.

Platforms:None

Stars13

Updated15 years ago

LicenseUnknown

Release2010

Genre: FPS

Theme: Sci-Fi

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DNF-reimposition

Clone of Duke Nukem Forever

A mod project for Duke Nukem Forever (2011) adding a level/asset editor and aiming to fix up the base game, unaffiliated with Gearbox.

Platforms:Windows

Stars12

Updated3 years ago

LicenseUnknown

Release2022

Genre: FPS

Theme: Adult

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EF2GameSource

Clone of Star Trek: Elite Force II

A maintenance update of the Star Trek: Elite Force II game source code, updated to compile under Visual Studio 2017 and on Linux.

Platforms:WindowsLinux

Stars12

Updated8 years ago

LicenseUnknown

Release2012

Genre: FPS

Theme: Sci-Fi

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