Free & Open Source FPS Games
341 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.
Sporadic
Original game image
Original game imageClone of Duke Nukem 3D
Raze is a GZDoom-powered source port that runs Duke Nukem 3D, Blood, Shadow Warrior, and other Build-engine games.
Sporadic
Original game image
Original game imageClone of GoldenEye 007
A work-in-progress native PC recompilation of the Xbox 360 GoldenEye 007 with online multiplayer and higher FPS.
Stars871
Updated4 months ago
LicenseUnlicense
Release2026
Genre: FPS
Theme: —
Active
Active
Clone of Halo: Combat Evolved
A port of the Halo: Combat Evolved Xbox decompilation to Linux, Windows and Android; you supply a disc image.
Stars850
Updated1 month ago
LicenseCC0-1.0
Release2026
Genre: FPS
Theme: —
Active
Original game image
Original game imageClone of Quake
LibreQuake is free, GPL-compatible replacement game data for Quake, requiring a separate compatible engine such as vkQuake to run.
Active
Sporadic
Clone of Medal of Honor: Allied Assault
An open-source engine for Medal of Honor: Allied Assault and its expansions, adding bots and modern-system support.
Active
ActiveOriginal game image
Original game imageClone of GoldenEye 007
A work-in-progress decompilation of Goldeneye 007 that builds three ROMs and needs a prior copy of the game for assets.
Stars796
Updated2 months ago
LicenseUnknown
Release2020
Genre: FPS
Theme: —
Active
Original game image
Original game imageClone of Call of Duty: Modern Warfare 2
Modern Warfare 2, Skate 3 and Minecraft in one Rust game, built on the IW4L engine; needs your own copy of MW2.
Stars776
Updated1 month ago
LicenseApache-2.0
Release2026
Genre: FPS
Theme: —
Active
Clone of Call of Duty: Modern Warfare 2
A Rust and Bevy engine that runs Call of Duty: Modern Warfare 2 from your own game files; gameplay is still incomplete.
Stars773
Updated1 month ago
LicenseApache-2.0
Release2026
Genre: FPS
Theme: —
Active
Clone of Doom
DOOM Retro is a Windows Doom source port by Brad Harding since 2013, aiming for a dark, gritty, pixelated take on the classic game.
Active
Clone of Star Wars Jedi Knight: Dark Forces II
A function-by-function C reimplementation of Jedi Knight: Dark Forces II for Windows, macOS, Linux and more.
Stars760
Updated1 month ago
LicenseUnknown
Release2018
Genre: Fighting
Theme: Fantasy
Halted
Original game image
Original game imageClone of Return to Castle Wolfenstein
iortcw is a modernized baseline engine for Return to Castle Wolfenstein and its mods, with development now halted but still playable.
Active
Clone of Metroid Prime
An alpha-stage native reimplementation of Metroid Prime for Windows, macOS and Linux.
Active
Clone of Wolfenstein: Enemy Territory
An open-source continuation of Wolfenstein: Enemy Territory with a modernized, compatible engine plus a feature-adding Legacy mod.
Platforms:WindowsLinuxOSX
Stars718
Updated1 month ago
LicenseGPL-3.0
Release2020
Genre: FPS
Theme: World War II
Sporadic
Active
Original game image
Original game imageClone of Descent
A source port of Descent and Descent II that modernizes them for current PCs with OpenGL rendering and UDP multiplayer.
Halted
Original game image
Original game imageClone of Spear of Destiny
id Software's GPL source release for the free, browser-playable version of Wolfenstein 3D published by Bethesda.
HaltedOriginal game image
Original game imageClone of Return to Castle Wolfenstein
Official id Software GPL source release of Return to Castle Wolfenstein's single-player code; game data isn't included.
Archived
Original game image
Original game imageClone of Duke Nukem 3D
A faithful, now-archived source port of Duke Nukem 3D staying close to the original code, with added educational comments.
Halted
Original game image
Original game imageClone of Wolfenstein: Enemy Territory
id Software's GPL release of Wolfenstein: Enemy Territory, the free multiplayer FPS spun off from Return to Castle Wolfenstein.
Platforms:WindowsLinux
Stars613
Updated14 years ago
LicenseGPL-3.0
Release2012
Genre: FPS
Theme: World War II
Active
Original game image
Original game imageClone of Portal
A fan-made N64 demake of Valve's Portal, requiring your own legally owned copy of the original game's files.
Active
Sporadic
Halted
Active
Clone of Quake
DarkPlaces is a Quake engine fork adding modern rendering and an expanded QuakeC scripting language, running many Quake-based games.
Halted
Original game image
Original game imageClone of Halo: Combat Evolved
Re-implements Halo: Combat Evolved piece by piece in C, patched into the original Xbox executable.
Stars439
Updated3 years ago
LicenseUnknown
Release2022
Genre: FPS
Theme: —
Archived
Active
Halted
HaltedOriginal game image
Original game imageClone of Return to Castle Wolfenstein
Official id Software GPL source release of Return to Castle Wolfenstein's multiplayer code; game data isn't included.
Active
Original game image
Original game imageClone of Blake Stone: Planet Strike
BStone is an actively maintained source port of the Blake Stone series, adding high-res 3D rendering, texture upscaling, and 3D audio.
Sporadic
Clone of Quake
FTEQW is an advanced, portable open-source engine for idTech games like Quake, Quake II, and III, with servers holding hundreds of players.
Halted
Original game image
Original game imageClone of Doom
id Software's free GPL source-code release of DOOM Classic for iOS, not including any game data, which remains under the original EULA.
Active
Clone of Quake
A browser-playable Three.js port of Quake, bundling shareware Episode 1 and supporting the full game with your own data.
ArchivedOriginal game image
Original game imageClone of Duke Nukem 3D
3D Realms' official GPL-licensed source code release of Duke Nukem 3D v1.5 (CD version), dated April 1, 2003, without the game's data files.
Active
Clone of Battle Zone
BZFlag is an open-source multiplayer game combining Battle Zone-style tank combat with capture-the-flag, originally built for SGI Irix.