Free & Open Source FPS Games
300 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
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
Active
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
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
Archived
Halted
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.
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
Halted
Clone of Dark Forces
A cross-platform reimplementation of the engines behind Daggerfall, Dark Forces, Blood, Outlaws, and Shadow Warrior.
Active
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
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
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
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
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
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
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.