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
Active
Clone of Metroid Prime
A work-in-progress decompilation of the GameCube Metroid Prime, built from your own copy of the game.
Sporadic
Clone of Doom
A portable, enhanced source port supporting Doom I/II, Heretic, and Hexen, built as cross-platform C++ libraries.
Archived
Sporadic
Clone of Counter-Strike
A reimplementation on the FTEQW engine and Nuclide SDK that lets players run the original Half-Life mod Counter-Strike 1.5.
Sporadic
Active
Active
Halted
Halted
Clone of Ace of Spades
An open-source reimplementation of the classic "voxlap" Ace of Spades, built without original code, for low-end systems.
Platforms:WindowsLinux
Stars281
Updated1 year ago
LicenseGPL-3.0
Release2016
Genre: FPS
Theme: World War II
Sporadic
Sporadic
Halted
Original game image
Original game imageClone of Natural Selection
The official GPL source release of Natural Selection, the Half-Life mod by Unknown Worlds.
Active
Original game image
Original game imageClone of Doom
An advanced Doom-engine source port descended from SMMU, built with SDL2 and actively maintained across major platforms.
Active
Clone of Doom
A community source port enhancing Ultimate DOOM, DOOM II, and DOOM 3, requiring a legally owned copy of DOOM 3 BFG Edition.
Halted
Original game image
Original game imageClone of Miner Wars 2081
Keen Software House's official mod kit for Miner Wars 2081, built on the game's released source code.
Halted
Clone of Hovertank 3D
id Software's official 1991 source code release of Hovertank 3D, written in Borland C++ and released under the GPLv2.
Sporadic
Active
Clone of Metroid Prime Hunters
A public-alpha native recompilation of the USA revision-0 release of Metroid Prime Hunters, built on ndsrecomp.
Stars248
Updated1 month ago
LicenseMIT
Release2026
Genre: FPS
Theme: —
Halted
Archived
Original game image
Original game imageClone of Doom 64
Doom 64 EX+ is a community-driven continuation of Doom 64 EX, faithfully recreating N64 Doom 64 with modern features.
Halted
Original game image
Original game imageClone of Half-Life 2
Active
Clone of Quake
Chocolate Quake is a minimalist Quake source port preserving the original DOS/WinQuake v1.09 experience over modern enhancements.
Sporadic
Clone of Doom
A pure Java source port of Doom, nearly complete but still missing network multiplayer.
Active
Original game image
Original game imageClone of The Darkness
A native Windows x64 port of The Darkness (Xbox 360) made by translating the console executable to C++.
Stars208
Updated1 month ago
LicenseGPL-3.0
Release2026
Genre: FPS
Theme: —
Archived
Clone of GoldenEye 007
GoldenEye: Source is a total conversion mod for Half-Life 2 recreating GoldenEye 007, last major-released as version 5.0 in August 2016.
Halted
Clone of Catacomb 3-D
This is the original, GPLv2-licensed source code for Catacomb 3-D: The Descent, requiring separately acquired game data to run.
Sporadic
Active
Original game image
Original game imageClone of GoldenEye 007
A native PC port of GoldenEye 007, compiled from the N64 decompilation and run at 60 fps from your own ROM.
Stars194
Updated1 month ago
LicenseMIT
Release2026
Genre: FPS
Theme: —
Halted
Active
Original game image
Original game imageClone of Catacomb 3-D
CatacombGL is an OpenGL source port of the four Catacomb games, adding widescreen support and uncapped framerate for Windows and Linux.
Sporadic
Sporadic
Clone of Serious Sam: The First Encounter
A cross-platform, distro-packaged build of the open-source Serious Engine for playing Serious Sam Classic.
Halted
Original game image
Original game imageClone of Powerslave
An unofficial fan remake of Powerslave built on an early version of the author's custom Kex game engine.
Platforms:WindowsSwitchXbox Series S/X
Stars182
Updated7 years ago
LicenseGPL-3.0
Release2017
Genre: FPS
Theme: Ancient History
Sporadic
Sporadic
Clone of Chasm: The Rift
A free SDL2 recreation of Chasm: The Rift that runs on the original game's data.
Sporadic
Clone of System Shock
An in-progress fan remake of System Shock replacing its 2D sprites with 3D models, in final testing for Windows, macOS, and Linux.
Active
Original game image
Original game imageClone of Perfect Dark
A beta VR-only fork of Perfect Dark for standalone VR headsets and PCVR, needing a Perfect Dark NTSC ROM.
Stars166
Updated1 month ago
LicenseMIT
Release2026
Genre: FPS
Theme: —
Active
Original game image
Original game imageClone of Halo: Combat Evolved
A work-in-progress decompilation of Halo: Combat Evolved build 2342, with progress tracked on decomp.dev.
Stars165
Updated1 month ago
LicenseCC0-1.0
Release2025
Genre: FPS
Theme: —