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.
Halted
Original game image
Original game imageClone of Magic Carpet
Active
Active
Original game image
Original game imageClone of Serious Sam: Next Encounter
An unofficial fan project that turns your own GameCube disc of Serious Sam: Next Encounter into a native Windows PC program.
Stars10
Updated1 month ago
LicenseUnknown
Release2026
Genre: FPS
Theme: —
Active
Original game image
Original game imageClone of Star Trek: Voyager – Elite Force
A native Android port of Star Trek: Voyager - Elite Force Holomatch with a Vulkan renderer and touch controls.
Halted
Sporadic
Active
Original game image
Original game imageClone of Witchaven
Halted
Active
Original game image
Original game imageClone of Return to Castle Wolfenstein
A Return to Castle Wolfenstein source port based on iortcw, with a higher tick rate, Steam file detection and a CMake build.
Active
Clone of Star Wars Jedi Knight: Dark Forces II
A fork of OpenJKDF2 that ports the engine to the original Microsoft Xbox, using xquake's FakeGL renderer.
Stars8
Updated1 month ago
LicenseUnknown
Release2026
Genre: Fighting
Theme: Fantasy
Halted
Clone of Shadow Warrior
icculus.org's Linux port of 3D Realms' 2005 GPL source release of Shadow Warrior.
Halted
Original game image
Original game imageClone of Alien Breed 3D
An Amiga build of John Girvin's Alien Breed 3D source, reviving the Chunky-Copper renderer for RTG output; currently unplayable.
Sporadic
Original game image
Original game imageClone of Quake
A minimalist source port of QuakeWorld preserving the classic multiplayer experience without modern enhancements, built with CMake.
Active
Halted
Clone of Alien Breed 3D
A rebuild of Alien Breed 3D I for AGA Amiga from the original source, requiring original data files; playable, but development has halted.
Halted
Clone of Quake 2
An unofficial, software-rendered Dreamcast port of Quake II, running from demo or full commercial game data.
Archived
Active
Halted
Original game image
Original game imageClone of Wolfenstein 3D
A stripped-down Wolfenstein 3D port for the Stellaris LM3S6965EVB microcontroller, using 4-bit greyscale graphics.
Halted
Original game image
Original game imageClone of Star Wars Jedi Knight II: Jedi Outcast
Raven Software and Activision's official 2002 GPLv2 source release of Jedi Knight II: Jedi Outcast, not a third-party reimplementation.
HaltedOriginal game image
Original game imageClone of Magic Carpet
Active
Clone of Gloom
An Android and OUYA port of the ZGloom engine for playing Amiga Gloom and its successors with a gamepad.
Halted
Clone of Ken's Labyrinth
A port of Ken's Labyrinth to modern Windows and Unix via SDL and OpenGL, keeping the original gameplay but requiring its data files.
Active
HaltedOriginal game image
Original game imageClone of Magic Carpet
Halted
Original game image
Original game imageClone of Quake 2
A port of GL Quake II to run under Wayland on the Nemo platform, with no further detail given beyond its name.
Sporadic
Sporadic
Original game image
Original game imageClone of Doom
The Linux Doom source converted to SDL3 and 64-bit, with no other changes, for macOS, Linux and Windows.
Halted
Active
Active
Original game image
Original game imageClone of Perfect Dark
A work-in-progress port of the Perfect Dark decompilation to modern platforms.
Stars3
Updated2 months ago
LicenseMIT
Release2026
Genre: FPS
Theme: —
Halted
Clone of Quake
An unofficial Dreamcast port of the original Quake, with software and GL renderers, mod support, and VMU save compression.
Active
Archived
Archived
Original game image
Original game imageHalted
Clone of Corridor 8: Galactic Wars
A fan-preserved prototype source archive of the DOS game Corridor 8: Galactic Wars, distinct from Corridor 7 despite similar filenames.
Active
Clone of G-Police: Weapons of Justice
A static recompilation setup kit for G-Police: Weapons of Justice; you supply your own disc image and BIOS.
Stars2
Updated1 month ago
LicenseGPL-3.0
Release2026
Genre: FPS
Theme: —
Halted
Original game image
Original game imageClone of Ken's Labyrinth
A port of Ken's Labyrinth to modern systems using OpenGL/OpenGLES, built on LAB3D/SDL with Wiz and Caanoo handheld support.