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 Descent 3
A new engine for Descent 3 built from its 1.5 source release, adding windowed modes, adjustable FOV, and an improved sound system.
Sporadic
Clone of Serious Sam: The First Encounter
A Vulkan-rendering fork of the open-source Serious Engine for playing Serious Sam Classic on modern systems.
Active
Original game image
Original game imageClone of Perfect Dark
A Perfect Dark PC port fork that adds jumping, rolling, a third-person camera and up to 80 simulants; you supply your own ROM.
Stars150
Updated1 month ago
LicenseMIT
Release2026
Genre: FPS
Theme: —
Active
Clone of Magic Carpet 2
remc2 is a reverse-engineered, HD-resolution (up to 4K) reimplementation of Magic Carpet 2 with modern controls.
Halted
Clone of Strife
Night Dive Studios' 2020 GPL source release of Strife: Veteran Edition, the official remaster of 1996's Strife.
Platforms:WindowsLinuxOSX
Stars143
Updated4 years ago
LicenseGPL-2.0
Release2014
Genre: Action
Theme: Post-Apocalyptic
Sporadic
Clone of Duke Nukem 3D
JFDuke3D is a Duke Nukem 3D source port on the author's own Build engine port, first released in 2003 for Windows, Linux, BSD, and macOS.
Active
Original game image
Original game imageClone of Catacomb 3-D
A Chocolate-Doom-inspired family of DOS source ports covering Keen Dreams, Catacomb 3-D, Wolfenstein 3D, and BioMenace.
Platforms:WindowsLinuxOSX
Stars137
Updated3 months ago
LicenseUnknown
Release2014
Genre: Action
Theme: Fantasy
Halted
Clone of The Colony
The official Apache 2.0 source release of David A. Smith's 1988 Macintosh 3D adventure/shooter, with PC and Amiga ports.
Halted
Original game image
Original game imageClone of The Operative: No One Lives Forever
Monolith's official 2001 source code release for No One Lives Forever, published for modding the game.
Halted
Clone of Urban Assault
An open-source, GPLv2 reimplementation of the Urban Assault engine that requires the original game's files to run.
Archived
Clone of Quake
Dungeon of Quake is a simple Quake-inspired FPS built with Odin and Raylib, using its own ASCII map format and a companion map editor.
Halted
Original game image
Original game imageClone of Trespasser
A git-based fork of Trespasser's original source code, preserving its original Visual Studio project structure largely as shipped.
Active
Clone of Team Fortress 2
Gang Garrison 2 is an open-source 2D, 8-bit side-scrolling demake of Team Fortress 2, with ten classes, six modes, and 20 official maps.
Halted
Clone of Ace of Spades
Iceball is an open-source, extensible engine and game built on the classic Ace of Spades experience, for Windows, Linux, and macOS.
Platforms:WindowsLinuxOSX
Stars118
Updated5 years ago
LicenseGPL-3.0
Release2012
Genre: FPS
Theme: World War II
Active
Clone of Prey
A community source-port integration of Prey (2006)'s SDK with the open-source Doom 3 GPL engine; still visually unfinished.
Active
Original game image
Original game imageClone of Quake 2
An experimental Yamagi Quake II fork adding Nightdive's Quake II remaster support and other id Tech-era game formats.
Archived
Original game image
Original game imageClone of Rise of the Triad
Apogee's official 2002 GPL source release of Rise of the Triad: Dark War (v1.3), one of the earliest FPS games with rocket jumping and CTF.
Halted
Clone of Star Wars Jedi Knight: Dark Forces II
Gorc is an early-development open-source recreation of the Jedi Knight: Dark Forces II engine, aiming to run its levels on new platforms.
Halted
Original game image
Original game imageClone of Wolfenstein 3D
A browser-playable build of id Software/Bethesda's official HTML5 Wolfenstein 3D anniversary release, lightly modified to run here.
ActiveOriginal game image
Original game imageClone of Perfect Dark
A complete matching decompilation of Rare's Perfect Dark for N64 that rebuilds a byte-identical ROM from your own copy.
Halted
Clone of Rise of the Triad
An SDL2-based Rise of the Triad source port with new gameplay modes and high-res support.
Halted
Original game image
Original game imageClone of Gloom
The official source code for Gloom, an Amiga first-person shooter by Black Magic, released as-is with no completeness guarantee.
Active
Original game image
Original game imageClone of Magic Carpet 2
A C/C++ reverse-engineering of Magic Carpet 2 with HD rendering and WASD controls; the full campaign is playable on Windows and Linux.
Active
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.
Active
Sporadic
Clone of Shadow Warrior
JFSW is a source port of the original 1997 Shadow Warrior, built on the author's own Build engine port, first released in 2005.
Halted
ActiveOriginal game image
Original game imageClone of Perfect Dark
A work-in-progress port of the Perfect Dark decompilation to modern platforms; requires your own ROM.
Stars97
Updated2 months ago
LicenseMIT
Release2025
Genre: FPS
Theme: —
Archived
Original game image
Original game imageClone of Descent II
Parallax Software's original 1999 Descent II source release, missing third-party code so it won't compile as-is.
Halted
Active
Original game image
Original game imageClone of Descent
A browser-playable Three.js port of Descent, bundling shareware Episode 1 and supporting the full game with your own copy.
Halted
Original game image
Original game imageClone of Serious Sam: The Second Encounter
An Android port of Serious Sam Classic: The Second Encounter that runs using your own copy of the original game files.
Halted
Clone of Catacomb 3-D
This repository holds the original source code for The Catacomb Abyss, compiling with Borland C++, released under the GNU GPLv2.
Active
Clone of Wolfenstein 3D
A from-scratch Rust recreation of Wolfenstein 3D, bundling the shareware version and offering a browser-playable web build.
Sporadic
Original game image
Original game imageClone of Aliens Versus Predator
An SDL3 source port of Aliens Versus Predator Gold for Windows, macOS and Linux; needs the original game data.
Sporadic
Clone of The Operative: No One Lives Forever
A Windows patch for No One Lives Forever that fixes bugs, restores multiplayer and adapts the game to modern resolutions.
Halted
Clone of Doom
A remaster of the 3DO version of DOOM for Windows, macOS and Linux, based on its official source release.
Sporadic
Original game image
Original game imageClone of Serious Sam: The Second Encounter
An Android port of Serious Sam Classic: The First Encounter and The Second Encounter, using the PC game's data files.
Stars80
Updated7 months ago
LicenseUnknown
Release2020
Genre: FPS
Theme: —
Active
Original game image
Original game imageClone of Return to Castle Wolfenstein
A standalone Android VR port of the Return to Castle Wolfenstein campaign for OpenXR headsets such as Quest and Pico.