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.

Active

SLADE

Clone of Doom

SLADE3 is an all-in-one editor for Doom-engine games, merging the older SLumpEd and SLADE map-editing tools into one program.

Platforms:WindowsLinuxOSX

Stars868

Updated14 days ago

LicenseGPL-2.0

Release2012

Genre: FPS

Theme: Sci-Fi

Active

No preview

LibreQuake

Clone of Quake

LibreQuake is free, GPL-compatible replacement game data for Quake, requiring a separate compatible engine such as vkQuake to run.

Platforms:WindowsLinuxOSX

Stars823

Updated14 days ago

LicenseUnknown

Release2019

Genre: FPS

Theme: Fantasy

Active

Aleph One

Clone of Marathon

Aleph One is the open-source, GPLv3 continuation of Bungie's Marathon engines, playing Marathon, Marathon 2, and Marathon Infinity.

Platforms:WindowsLinuxOSX

Stars809

Updated18 days ago

LicenseGPL-3.0

Release2015

Genre: FPS

Theme: Sci-Fi

Sporadic

OpenMoHAA

Clone of Medal of Honor: Allied Assault

An open-source engine for Medal of Honor: Allied Assault and its expansions, adding bots and modern-system support.

Platforms:WindowsLinuxOSX

Stars807

Updated5 months ago

LicenseGPL-2.0

Release2015

Genre: FPS

Theme: —

Active

No preview

NBlood

Clone of Blood

Reverse-engineered EDuke32-based ports of Blood, PowerSlave/Exhumed, Duke Nukem 3D and other Build engine games.

Platforms:Windows

Stars803

Updated12 days ago

LicenseUnknown

Release2019

Genre: FPS

Theme: —

Active

DOOM Retro

Clone of Doom

DOOM Retro is a Windows Doom source port by Brad Harding since 2013, aiming for a dark, gritty, pixelated take on the classic game.

Platforms:Windows

Stars771

Updated11 days ago

LicenseGPL-3.0

Release2013

Genre: FPS

Theme: Sci-Fi

Halted

No preview

iortcw

Clone of Return to Castle Wolfenstein

iortcw is a modernized baseline engine for Return to Castle Wolfenstein and its mods, with development now halted but still playable.

Platforms:WindowsLinuxOSX

Stars751

Updated2 years ago

LicenseGPL-3.0

Release2015

Genre: FPS

Theme: Sci-Fi

Active

Metaforce

Clone of Metroid Prime

An alpha-stage native reimplementation of Metroid Prime for Windows, macOS and Linux.

Platforms:WindowsLinuxOSX

Stars742

Updated23 days ago

LicenseUnknown

Release2015

Genre: FPS

Theme: —

Active

ET: Legacy

Clone of Wolfenstein: Enemy Territory

An open-source continuation of Wolfenstein: Enemy Territory with a modernized, compatible engine plus a feature-adding Legacy mod.

Platforms:WindowsLinuxOSX

Stars718

Updated12 days ago

LicenseGPL-3.0

Release2020

Genre: FPS

Theme: World War II

Sporadic

WebQuake

Clone of Quake

WebQuake is a browser-based HTML5/WebGL port of Quake that supports multiplayer with native WinQuake and GLQuake clients.

Platforms:Web

Stars652

Updated5 months ago

LicenseUnknown

Release2013

Genre: FPS

Theme: Fantasy

Active

No preview

DXX-Rebirth

Clone of Descent

A source port of Descent and Descent II that modernizes them for current PCs with OpenGL rendering and UDP multiplayer.

Platforms:WindowsLinuxOSX

Stars637

Updated27 days ago

LicenseUnknown

Release2013

Genre: FPS

Theme: Sci-Fi

Halted

No preview

wolf3d-browser

Clone of Spear of Destiny

id Software's GPL source release for the free, browser-playable version of Wolfenstein 3D published by Bethesda.

Platforms:Web

Stars632

Updated13 years ago

LicenseGPL-2.0

Release2013

Genre: FPS

Theme: —

Halted

No preview

Return to Castle Wolfenstein Single Player

Clone of Return to Castle Wolfenstein

Official id Software GPL source release of Return to Castle Wolfenstein's single-player code; game data isn't included.

Platforms:Windows

Stars627

Updated5 years ago

LicenseGPL-3.0

Release2012

Genre: FPS

Theme: Sci-Fi

Archived

No preview

Chocolate Duke3D

Clone of Duke Nukem 3D

A faithful, now-archived source port of Duke Nukem 3D staying close to the original code, with added educational comments.

Platforms:WindowsLinuxOSX

Stars619

Updated7 years ago

LicenseUnknown

Release2012

Genre: FPS

Theme: —

Halted

No preview

Wolfenstein: Enemy Territory

Clone of Wolfenstein: Enemy Territory

id Software's GPL release of Wolfenstein: Enemy Territory, the free multiplayer FPS spun off from Return to Castle Wolfenstein.

Platforms:WindowsLinux

Stars613

Updated14 years ago

LicenseGPL-3.0

Release2012

Genre: FPS

Theme: World War II

Active

No preview

Portal 64: Still Alive

Clone of Portal

A fan-made N64 demake of Valve's Portal, requiring your own legally owned copy of the original game's files.

Platforms:N64

Stars611

Updated14 days ago

LicenseMIT

Release2023

Genre: FPS

Theme: —

Active

Helion

Clone of Doom

A performance-focused, from-scratch Doom source port using static rendering to run complex modern maps well on any hardware.

Platforms:WindowsLinux

Stars570

Updated11 days ago

LicenseGPL-3.0

Release2019

Genre: FPS

Theme: Sci-Fi

Sporadic

No preview

PsyDoom

Clone of Doom

A reverse-engineered PC backport of PlayStation Doom and Final Doom, with an optional Vulkan renderer for widescreen.

Platforms:WindowsLinuxOSX

Stars542

Updated11 months ago

LicenseGPL-3.0

Release2019

Genre: FPS

Theme: Sci-Fi

Halted

No preview

Wolf3D-iOS

Clone of Wolfenstein 3D

Platforms:iOS

Stars539

Updated4 years ago

LicenseGPL2*

Release2012

Genre: FPS

Theme: —

Active

DarkPlaces

Clone of Quake

DarkPlaces is a Quake engine fork adding modern rendering and an expanded QuakeC scripting language, running many Quake-based games.

Platforms:WindowsLinuxOSX

Stars443

Updated25 days ago

LicenseGPL-2.0

Release2021

Genre: FPS

Theme: Fantasy

Archived

No preview

Descent

Clone of Descent

Parallax Software's original 1998 Descent 1 source code, released without the sound and modem code the studio didn't own the rights to.

Platforms:WindowsOSXSaturn

Stars430

Updated8 years ago

LicenseUnknown

Release2012

Genre: FPS

Theme: Sci-Fi

Active

ezQuake

Clone of Quake

ezQuake is a modern QuakeWorld client combining features from established clients, with QTV spectating, a server browser, and scripting.

Platforms:WindowsLinuxOSX

Stars415

Updated13 days ago

LicenseGPL-2.0

Release2010

Genre: FPS

Theme: Fantasy

Halted

glPortal

Clone of Portal

GlPortal is an open-source sci-fi first-person puzzle-platformer with realistic physics, built on the custom RadixEngine, cross-platform.

Platforms:WindowsLinux

Stars384

Updated2 years ago

LicenseUnknown

Release2014

Genre: FPS

Theme: —

Halted

No preview

Return to Castle Wolfenstein Multiplayer

Clone of Return to Castle Wolfenstein

Official id Software GPL source release of Return to Castle Wolfenstein's multiplayer code; game data isn't included.

Platforms:Windows

Stars378

Updated14 years ago

LicenseGPL-3.0

Release2012

Genre: FPS

Theme: Sci-Fi

Active

No preview

BStone

Clone of Blake Stone: Planet Strike

BStone is an actively maintained source port of the Blake Stone series, adding high-res 3D rendering, texture upscaling, and 3D audio.

Platforms:WindowsLinuxOSX

Stars367

Updated1 month ago

LicenseUnknown

Release2013

Genre: FPS

Theme: Sci-Fi

Sporadic

FTE QuakeWorld

Clone of Quake

FTEQW is an advanced, portable open-source engine for idTech games like Quake, Quake II, and III, with servers holding hundreds of players.

Platforms:WindowsLinux

Stars341

Updated3 months ago

LicenseGPL-2.0

Release2021

Genre: FPS

Theme: Fantasy

Halted

No preview

Doom Classic for iOS

Clone of Doom

id Software's free GPL source-code release of DOOM Classic for iOS, not including any game data, which remains under the original EULA.

Platforms:iOS

Stars339

Updated10 years ago

LicenseGPL-2.0

Release2014

Genre: FPS

Theme: Sci-Fi

Active

three-quake

Clone of Quake

A browser-playable Three.js port of Quake, bundling shareware Episode 1 and supporting the full game with your own data.

Platforms:Web

Stars333

Updated1 month ago

LicenseGPL-2.0

Release2026

Genre: FPS

Theme: Fantasy

Archived

No preview

Duke Nukem 3D

Clone of Duke Nukem 3D

3D Realms' official GPL-licensed source code release of Duke Nukem 3D v1.5 (CD version), dated April 1, 2003, without the game's data files.

Platforms:WindowsDOS

Stars330

Updated13 years ago

LicenseUnknown

Release2013

Genre: FPS

Theme: —

Active

BZFlag

Clone of Battle Zone

BZFlag is an open-source multiplayer game combining Battle Zone-style tank combat with capture-the-flag, originally built for SGI Irix.

Platforms:WindowsLinuxOSX

Stars328

Updated18 days ago

LicenseUnknown

Release2015

Genre: FPS

Theme: —

Active

No preview

Woof!

Clone of Doom

A modern continuation of Lee Killough's MBF Doom source port, adding widescreen rendering, uncapped framerate, and gamepad support.

Platforms:WindowsLinux

Stars326

Updated11 days ago

LicenseGPL-2.0

Release2016

Genre: FPS

Theme: Sci-Fi

Sporadic

FreeHL

Clone of Half-Life

A QuakeC reimplementation of Half-Life via the Nuclide SDK on the FTE Engine, semi-playable across Windows, macOS, and Linux.

Platforms:WindowsLinuxOSX

Stars320

Updated10 months ago

LicenseISC

Release2021

Genre: FPS

Theme: Sci-Fi

Active

No preview

Metroid Prime

Clone of Metroid Prime

A work-in-progress decompilation of the GameCube Metroid Prime, built from your own copy of the game.

Platforms:GameCube

Stars311

Updated11 days ago

LicenseUnknown

Release2022

Genre: FPS

Theme: —

Sporadic

Doomsday Engine

Clone of Doom

A portable, enhanced source port supporting Doom I/II, Heretic, and Hexen, built as cross-platform C++ libraries.

Platforms:WindowsLinuxOSX

Stars303

Updated3 months ago

LicenseUnknown

Release2011

Genre: FPS

Theme: Sci-Fi

Archived

PrBoom+

Clone of Doom

Platforms:WindowsLinuxOSX

Stars301

Updated3 years ago

LicenseGPL2*

Release2017

Genre: FPS

Theme: Sci-Fi

Sporadic

FreeCS

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.

Platforms:WindowsLinuxOSX

Stars300

Updated11 months ago

LicenseISC

Release2021

Genre: FPS

Theme: —

Sporadic

GBADoom

Clone of Doom

A Game Boy Advance port of prBoom supporting Doom's IWADs, with variable framerate and no multiplayer or demo support.

Platforms:GBA

Stars297

Updated1 year ago

LicenseUnknown

Release2019

Genre: FPS

Theme: Sci-Fi

Active

Xonotic

Clone of Nexuiz

A free, open-source arena shooter forked from the original GPL Nexuiz after its name went commercial.

Platforms:WindowsLinuxOSX

Stars297

Updated19 days ago

Licensegpl-3.0

Release2014

Genre: FPS

Theme: —

Active

No preview

Odamex

Clone of Doom

A client/server Doom source port for Internet multiplayer with up to 255 players and many competitive game modes.

Platforms:WindowsLinuxOSX

Stars294

Updated11 days ago

LicenseGPL-2.0

Release2015

Genre: FPS

Theme: Sci-Fi

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