Open Source First-Person Shooters

Xonotic is a free (GPL), fast-paced first-person multiplayer shooter that works on Windows, OS X and Linux. The project is geared towards providing addictive arena shooter gameplay which is all spawned and driven by the community itself.

A PUBG 2017 Open Source Private Server.

Red Eclipse is a fun-filled new take on the first person arena shooter, built as a total conversion of Cube Engine 2, which lends itself toward a balanced gameplay, with a general theme of agility in a variety of environments.

Cube 2: Sauerbraten is a free multiplayer/singleplayer first person shooter, built as a major redesign of the Cube FPS.

Warsow is a completely free fast-paced first-person shooter (FPS) for Windows, Linux and Mac OS X, set in a futuristic cartoonish world where rocketlauncher-wielding pigs and lasergun-carrying cyberpunks roam the streets.

OpenArena is a community-produced deathmatch FPS based on GPL idTech3 technology. There are many game types supported including Free For All, Capture The Flag, Domination, Overload, Harvester, and more. There are 17 unique player models to choose from and 12 weapons.

AssaultCube is a free, multiplayer, first-person shooter game, based on the CUBE engine.

Taking place in realistic environments, with fast, arcade gameplay, it's addictive and fun!

Fortress Forever is a free game inspired by the earlier versions of the Team Fortress series (Team Fortress Classic and QuakeWorld Team Fortress).

ZDoom is a family of enhanced ports of the Doom engine for running on modern operating systems. It runs on Windows, Linux, and OS X, and adds new features not found in the games as originally published by id Software.

Nexuiz was originally developed by Lee Vermeulen and Forest ‘LordHavoc’ Hale, who started Alientrap in the summer of 2002. The goal of the project was to create a high quality first person shooter that could be played freely across all platforms in one package: PC, Mac, and...

Freedoom is a WIP a complete free content game based on the Doom engine. It's not an engine, but it's replacement game data with entirely original content, Compatible with a majority of game mods made for Doom. Comes in Three Flavors~.

Tremulous is a free, open source game that blends a team based FPS with elements of an RTS. Players can choose from 2 unique races, aliens and humans. Players on both teams are able to build working structures in-game like an RTS.

Suckless, anticapitalist, public domain game for everyone.

Unvanquished is a free, open-source first-person shooter combining real-time strategy elements with a futuristic, sci-fi setting. It is available for Windows, Linux, and Mac OS X.

Digital Paint: Paintball 2 is a Paintball game that started out as a mod for quake 2 but then took on a life of its own as an open source fps game with a global player and clan management system.

Quetoo is a Free, standalone first person shooter video game based on id Tech2. Our goal is to bring the fun of oldschool deathmatch to a more contemporary platform, and perhaps to a new generation of gamers.

Alien Arena is a free and opensource first-person shooter game that combines a 1950s-era sci-fi atmosphere with gameplay similar to Quake , Doom and .

Crispy Doom is a source port developed by Fabian Greffrath forked from Chocolate Doom which provides a higher display resolution, removes the static limits of the Doom engine, and offers further optional visual, tactical and physical enhancements while remaining fully compatible...

Wolfenstein: Enemy Territory is a free multiplayer first-person shooter. Set during World War II and heavily focused on team work, it was initially released in 2003 by Splash Damage and id Software. More than a decade after its release, after spending countless hours of...

Build engine port backed by GZDoom tech. Currently supports Duke Nukem 3D, Blood, Shadow Warrior, Redneck Rampage and Powerslave/Exhumed.

1998 saw the public release of the Doom source code by its original authors, id Software. Since then, a large number of Doom "source ports" have been created by programmers, who have extended the code, adding new features and removing some of the limitations of DOS...

Zandronum is a multiplayer oriented port, based off Skulltag, for Doom and Doom II by id Software.

The Hammer of Thyrion project is a cross-platform source port effort of Raven Software's Hexen. Last updated 2018-06-06.

WoP is the domain of ENTE's comic strip super-hero bad-boy Padman and his motley crew, and their mission is to make your game with some seriously addictive fun, whatever your skill level and whatever character role you jump into.

A truly free and open source multiplayer shooter, no strings attached. Have casual deathmatch matches on various scenarios. Build your own levels with the ingame editor and assets that come with the game, or just play around and use it as a sandbox.