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.

Archived

Command & Conquer: Renegade

Clone of Command & Conquer: Renegade

Electronic Arts' official open-source release of the Renegade engine, paired with a Steam re-release adding Workshop support for user maps.

Platforms:Windows

Stars1,630

Updated1 year ago

LicenseGPL3*

Release2024

Genre: FPS

Theme: Modern Military

Sporadic

3DGE

Clone of Doom

3DGE is an advanced OpenGL source port built on the id Tech 1 engine, aimed at modders wanting an easy platform for new content.

Platforms:WindowsLinuxOSX

Stars82

Updated10 months ago

LicenseGPL2*

Release2015

Genre: FPS

Theme: Sci-Fi

Halted

Doom

Clone of Doom

id Software's original 1997 DOOM source code, released under GPL v2, powering the classic demon-hunting FPS on the UAC's Mars facility.

Platforms:LinuxDOS

Stars19,552

Updated2 years ago

LicenseGPL-2.0

Release2012

Genre: FPS

Theme: Sci-Fi

Active

No preview

Source SDK 2013

Clone of Half-Life 2

Valve's official SDK release with the game code for Half-Life 2, HL2: Deathmatch, and Team Fortress 2, for building mods.

Platforms:WindowsLinux

Stars10,002

Updated21 days ago

LicenseUnknown

Release2013

Genre: FPS

Theme: Sci-Fi

Halted

No preview

Quake III Arena

Clone of Quake 3

id Software's official GPL source release for Quake III Arena, including its full renderer, game code, and Q3Radiant editor.

Platforms:WindowsLinuxOSX

Stars8,231

Updated2 years ago

LicenseGPL-2.0

Release2012

Genre: FPS

Theme: Sci-Fi

Halted

Quake

Clone of Quake

id Software's official GPL source release for Quake (1996), covering WinQuake, GLQuake, QuakeWorld, and GLQuakeWorld.

Platforms:Windows

Stars6,052

Updated2 years ago

LicenseUnknown

Release2012

Genre: FPS

Theme: Fantasy

Halted

No preview

DOOM-3-BFG

Clone of Doom 3

id Software's Doom 3 BFG Edition GPL source release, code only, omitting features like Steam integration and Bink video playback.

Platforms:Windows

Stars5,375

Updated2 years ago

LicenseGPL-3.0

Release2012

Genre: FPS

Theme: Sci-Fi

Halted

No preview

Doom 3

Clone of Doom 3

id Software's Doom 3 GPL source release, code only, buildable on Windows, Linux, and macOS but omitting the Carmack's Reverse technique.

Platforms:WindowsLinuxOSX

Stars4,635

Updated4 years ago

LicenseGPL-3.0

Release2011

Genre: FPS

Theme: Sci-Fi

Active

OpenXRay

Clone of S.T.A.L.K.E.R.

A community-improved X-Ray Engine for S.T.A.L.K.E.R. with 64-bit support, bug fixes and Linux/macOS ports.

Platforms:Windows

Stars3,559

Updated11 days ago

LicenseUnknown

Release2014

Genre: FPS

Theme: Alternate Historical

Halted

No preview

Quake 2

Clone of Quake 2

id Software's official GPL source release for Quake II (v3.19), built and tested with Visual C++ 6.0.

Platforms:WindowsLinux

Stars3,343

Updated2 years ago

LicenseUnknown

Release2012

Genre: FPS

Theme: Sci-Fi

Halted

Serious Engine

Clone of Serious Sam: The First Encounter

Croteam's official open-source release of Serious Engine 1.10, the toolchain behind the original Serious Sam Classic games.

Platforms:Windows

Stars3,179

Updated5 years ago

LicenseGPL-2.0

Release2016

Genre: FPS

Theme: —

Active

No preview

GZDoom

Clone of Doom

GZDoom is a modder-friendly source port of the Doom engine covering Doom, Heretic, and Hexen, with OpenGL and Vulkan rendering support.

Platforms:WindowsLinux

Stars3,102

Updated1 month ago

LicenseGPL-3.0

Release2013

Genre: FPS

Theme: Sci-Fi

Sporadic

No preview

Descent 3

Clone of Descent 3

The official open-source release of the Descent 3 engine under GPL-3.0, running on Windows, Linux, macOS, and Android.

Platforms:WindowsLinuxOSX

Stars3,006

Updated8 months ago

LicenseGPL-3.0

Release2024

Genre: FPS

Theme: Sci-Fi

Active

No preview

ioquake3

Clone of Quake 3

ioquake3 is an actively maintained, modernized engine for Quake III Arena and Team Arena, supporting standalone games too.

Platforms:WindowsLinuxOSX

Stars2,821

Updated2 months ago

LicenseGPL-2.0

Release2012

Genre: FPS

Theme: Sci-Fi

Halted

No preview

Wolfenstein 3D

Clone of Wolfenstein 3D

id Software's official 1992 GPL source release for Wolfenstein 3D's DOS engine, including John Carmack's own retrospective notes.

Platforms:DOS

Stars2,540

Updated14 years ago

LicenseUnknown

Release2012

Genre: FPS

Theme: —

Active

Chocolate Doom

Clone of Doom

A source port that reproduces the original DOS Doom, Heretic, Hexen, and Strife with their original bugs intact on modern systems.

Platforms:WindowsLinuxOSX

Stars2,416

Updated18 days ago

LicenseGPL-2.0

Release2009

Genre: FPS

Theme: Sci-Fi

Active

vkQuake

Clone of Quake

A Vulkan-powered Quake port with better performance, modern rendering features, and support for the 2021 re-release.

Platforms:WindowsLinuxOSX

Stars2,279

Updated13 days ago

LicenseGPL-2.0

Release2016

Genre: FPS

Theme: Fantasy

Active

No preview

UZDoom

Clone of Doom

A modern GPLv3 source port continuing the ZDoom/GZDoom lineage for Doom, Heretic, and Hexen.

Platforms:WindowsLinuxOSX

Stars2,218

Updated12 days ago

LicenseUnknown

Release2025

Genre: FPS

Theme: Sci-Fi

Halted

No preview

Quake II Rerelease

Clone of Quake 2

id Software's official source for the 2023 Quake II Rerelease's game-logic DLL, merging all four expansion codebases into one.

Platforms:Windows

Stars2,203

Updated3 years ago

LicenseGPL-2.0

Release2023

Genre: FPS

Theme: Sci-Fi

Sporadic

dhewm3

Clone of Doom 3

A GPL-licensed Doom 3 source port for Windows, Linux, macOS, and FreeBSD using SDL and OpenAL, requiring separately supplied game data.

Platforms:WindowsLinuxOSX

Stars2,168

Updated3 months ago

LicenseGPL-3.0

Release2012

Genre: FPS

Theme: Sci-Fi

Active

RBDOOM-3-BFG

Clone of Doom 3

RBDOOM-3-BFG is a deeply modernized DOOM 3 BFG source port with PBR rendering and DX12/Vulkan support.

Platforms:Windows

Stars1,854

Updated1 month ago

LicenseGPL-3.0

Release2012

Genre: FPS

Theme: Sci-Fi

Sporadic

No preview

QuakeJS

Clone of Quake 3

A browser port of ioquake3 compiled with Emscripten — play Quake III Arena directly in your browser, no install needed.

Platforms:Web

Stars1,611

Updated10 months ago

LicenseUnknown

Release2013

Genre: FPS

Theme: Sci-Fi

Active

No preview

Quake3e

Clone of Quake 3

A modernized Quake III Arena engine (built on ioquake3) with optional Vulkan rendering, staying compatible with existing Q3A mods.

Platforms:WindowsLinuxOSX

Stars1,521

Updated21 days ago

LicenseGPL-2.0

Release2016

Genre: FPS

Theme: Sci-Fi

Halted

No preview

System Shock

Clone of System Shock

Night Dive Studios' GPL-licensed release of System Shock's 1994 classic Mac OS source code, without game data.

Platforms:Classic Mac OS

Stars1,465

Updated8 years ago

LicenseGPL-3.0

Release2018

Genre: RPG

Theme: —

Active

Freedoom

Clone of Doom

A free replacement for Doom's levels, art, sounds, and music, requiring a separate Doom source port to actually run it.

Platforms:None

Stars1,343

Updated3 months ago

LicenseUnknown

Release2012

Genre: FPS

Theme: Sci-Fi

Halted

No preview

DOOM-FX

Clone of Doom

Platforms:SNES

Stars1,248

Updated4 years ago

LicenseGPL-3.0

Release2020

Genre: FPS

Theme: Sci-Fi

Halted

OpenSpades

Clone of Ace of Spades

An open-source, cross-platform client for Ace of Spades 0.75 that connects to vanilla, pyspades and pysnip servers.

Platforms:WindowsOSX

Stars1,245

Updated2 years ago

LicenseGPL-3.0

Release2013

Genre: FPS

Theme: World War II

Active

No preview

Inexor

Clone of Cube 2: Sauerbraten

Inexor is an open-source, MIT-licensed C++/Vulkan renderer for a planned 3D octree game engine, running on Windows and Linux.

Platforms:WindowsLinux

Stars1,218

Updated1 month ago

LicenseMIT

Release2019

Genre: FPS

Theme: —

Active

DRL

Clone of Doom

DRL (DoomRL) is a free, open-source turn-based roguelike written in FreePascal, with code dating back to 2002.

Platforms:WindowsLinux

Stars1,179

Updated11 days ago

LicenseGPL-2.0

Release2016

Genre: FPS

Theme: Sci-Fi

Halted

No preview

doom3do

Clone of Doom

This is the archived 3DO port of DOOM by Rebecca Ann Heineman, using the 3DO's cell engine for walls and software-rendered floors.

Platforms:3DO

Stars1,172

Updated3 years ago

LicenseMIT

Release2014

Genre: FPS

Theme: Sci-Fi

Active

The Force Engine

Clone of Dark Forces

The Force Engine is a reverse-engineered rebuild of the Jedi Engine, currently offering full Dark Forces support with modern upgrades.

Platforms:Windows

Stars1,159

Updated13 days ago

LicenseGPL-2.0

Release2020

Genre: FPS

Theme: —

Active

Unvanquished

Clone of Gloom (Quake)

An open-source arena shooter blending FPS combat with RTS base-building, inspired by mods like Natural Selection.

Platforms:WindowsLinuxOSX

Stars1,125

Updated2 months ago

LicenseUnknown

Release2011

Genre: FPS

Theme: Sci-Fi

Active

SurrealEngine

Clone of Unreal Tournament

A reimplementation of Unreal Engine 1 aiming to run the original Unreal and Unreal Tournament using your own game files.

Platforms:WindowsLinuxOSX

Stars1,102

Updated12 days ago

LicenseUnknown

Release2020

Genre: FPS

Theme: Sci-Fi

Active

C-Dogs SDL

Clone of Wolfenstein 3D

C-Dogs SDL is an actively maintained SDL port of C-Dogs, adding 4-player co-op, deathmatch, and over 100 user campaigns.

Platforms:WindowsLinuxOSX

Stars1,084

Updated12 days ago

LicenseGPL-2.0

Release2013

Genre: FPS

Theme: —

Active

No preview

Yamagi Quake II

Clone of Quake 2

An enhanced, actively maintained Quake II client with widescreen, modern controller, and OpenGL 3.2 support.

Platforms:WindowsLinuxOSX

Stars1,003

Updated11 days ago

LicenseUnknown

Release2012

Genre: FPS

Theme: Sci-Fi

Active

Crispy Doom

Clone of Doom

Crispy Doom is a limit-removing Doom source port with higher resolution, widescreen, and uncapped framerate, staying demo-compatible.

Platforms:WindowsLinuxOSX

Stars947

Updated17 days ago

LicenseGPL-2.0

Release2014

Genre: FPS

Theme: Sci-Fi

Active

Shockolate

Clone of System Shock

An SDL2 cross-platform source port of System Shock, based on Night Dive Studios' released PowerPC source.

Platforms:WindowsLinuxOSX

Stars900

Updated18 days ago

LicenseGPL-3.0

Release2018

Genre: RPG

Theme: —

Active

qengine

Clone of Quake 2

A stripped-down engine forked from Quake II's codebase, built as a base for new standalone retro games, not for playing Quake II.

Platforms:WindowsLinux

Stars892

Updated1 month ago

LicenseGPL-2.0

Release2018

Genre: FPS

Theme: Sci-Fi

Sporadic

No preview

Raze

Clone of Duke Nukem 3D

Raze is a GZDoom-powered source port that runs Duke Nukem 3D, Blood, Shadow Warrior, and other Build-engine games.

Platforms:WindowsOSX

Stars885

Updated10 months ago

LicenseUnknown

Release2019

Genre: FPS

Theme: —

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