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.
Active
Original game image
Original game imageClone of GoldenEye 007
A work-in-progress decompilation of GoldenEye 007 for N64, rebuilding the NTSC-U, Japanese, and PAL ROMs against checksum verification.
Sporadic
Original game image
Original game imageClone of No One Lives Forever 2
LTJS is a work-in-progress source port of the LithTech Jupiter engine, currently supporting No One Lives Forever 2 (version 1.3).
Active
Clone of Unreal Tournament
An unofficial Android port of Unreal Tournament, controller-first, needing your own v1.400 game files.
Halted
Clone of Marathon 2
A port of the AlephOne engine to Android for playing the Marathon saga, with one APK per chapter.
Sporadic
Original game image
Original game imageClone of Quake
TurboQuake is a fork of Quake's source code optimized for older x86 hardware, with restored MS-DOS support.
Active
Archived
Original game image
Original game imageClone of Blood II: The Chosen
This repository contains the officially released LithTech-engine source code for Blood II: The Chosen, released by Monolith.
Halted
Original game image
Original game imageClone of SiN
Night Dive Studios' official source release of SiN Gold, the 1998 Ritual Entertainment shooter built on a modified Quake II engine.
Halted
Sporadic
Original game image
Original game imageClone of Return to Castle Wolfenstein
A PS Vita port of id Software's open-source Return to Castle Wolfenstein single-player release.
Active
Original game image
Original game imageClone of Alien Breed 3D II: The Killing Grounds
An actively maintained rebuild of the Alien Breed 3D II: The Killing Grounds engine, compatible with original game data or mods.
Sporadic
Clone of Star Trek: Voyager – Elite Force
An open-source engine reimplementation of Star Trek: Voyager - Elite Force's Holomatch mode, built on the ioquake3-derived ioEF engine.
Sporadic
Original game image
Original game imageClone of Rise of the Triad
A source port of Rise of the Triad (1994) for modern Linux, Windows, and macOS, with 64-bit and big-endian support.
Halted
Original game image
Original game imageClone of Descent
A source port of the DOS game Descent to Android and iOS; requires game files from a licensed copy.
ActiveOriginal game image
Original game imageClone of GoldenEye 007
A native PC port of GoldenEye 007 (Xbox 360/XBLA) made by static recompilation, with online multiplayer.
Stars54
Updated2 months ago
LicenseUnlicense
Release2026
Genre: FPS
Theme: —
Halted
Archived
Original game image
Original game imageClone of Wolfenstein 3D
The original 1994 Wolfenstein 3D source code for classic Mac OS, released by Interplay Productions under license from id Software.
Halted
Original game image
Original game imageClone of Nitemare 3D
A partial C# reimplementation of the 1994 FPS Nitemare 3D that loads the original maps, images and music.
Sporadic
Clone of No One Lives Forever 2
A Windows mod for No One Lives Forever 2 adding widescreen, anti-aliasing, a rewritten input system and crash fixes.
Halted
Halted
Archived
Halted
Halted
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.
Halted
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.
Active
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.
Halted
Original game image
Original game imageClone of Aliens Versus Predator
The released Windows source for Aliens versus Predator Gold, mirrored from a 2008 GameFront download; development here has halted.
ActiveOriginal game image
Original game imageClone of Rise of the Triad
An Android source port of the 1994/95 DOS shooter Rise of the Triad, with touch controls.
Halted
Clone of MechWarrior
Platforms:WindowsLinux
Stars38
Updated3 years ago
LicenseApache-2.0
Release2012
Genre: Simulation
Theme: Sci-Fi
Halted
Clone of Catacomb 3-D
The original GPLv2 source for The Catacomb Armageddon, built for Borland C++, with game data requiring separate legal acquisition.
Halted
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.
Halted
Clone of Super 3D Noah's Ark
The source code of Wisdom Tree's unlicensed SNES game Super Noah's Ark 3D.
Sporadic
Halted
Original game image
Original game imageClone 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.
Halted
Original game image
Original game imageClone 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.
Sporadic
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.
Halted
Sporadic
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.
Sporadic
Original game image
Original game imageClone of TekWar
A port of William Shatner's TekWar built on a port of the Build engine, run with data from an original release.