Alien Arena

Do you like fast paced deathmatch? How about rich, colorful, arcadelike atmospheres? How about...retro Sci Fi? Then you're going to love what Alien Arena has in store for you! This game combines some of the very best aspects of such games as Quake III and Unreal Tournament and wraps them up with a retro alien theme, while adding tons of original ideas to make the game quite unique.

The goal of Alien Arena was to create the perfect marriage between Quake and Unreal Tournament, between retro sci-fi and futuristic tech, and between casual gamer and advanced expert, and wrap it up in a package with quality that could rival that of commercial games. The game has a weapon set that is unique and fun, and deviates a bit away from the standard Q3 or UT2k4 weapons. Gameplay can be altered easily in the menu by choosing between the various game types, such as Deathmatch, Team Core Assault, All Out Assault, Capture the Flag, Duel, and Cattle Prod. Users can also apply a number of different mutators to the game rules as well, creating some pretty interesting scenarios.

Assault Cube

Formerly ActionCube, is a free first-person-shooter based on the game Cube. Set in a realistic looking environment, as far as that´s possible with this engine, while gameplay stays fast and arcade. This game is all about team oriented multilayer fun.

The latest AssaultCube release is v1.0.4

Blood Frontier

Blood Frontier is a Free and Open Source game, using SDL and OpenGL which allows it to be ported to many platforms; you can download a package for Windows, Linux/BSD or Mac OSX, or grab a development copy from our Subversion repository and live on the bleeding edge.

The game is a single-player and multi-player first-person shooter, built as a total conversion of Cube Engine 2, which lends itself toward a balanced gameplay, completely at the control of map makers, while maintaining a general theme of tactics and low gravity. For more information, please see our Wiki.

In a true open source by the people for the people nature, it tries to work closely with the gaming and open source communities to provide a better overall experience, taking all sorts of feedback from your average player, to your seasoned developer, aiming to create a story-driven game environment that is flexible, fun, easy to use, and pleasing to the eye.

Cube 2: Sauerbraten

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

Much like the original Cube, the aim of this game is not necessarily to produce the most features & eyecandy possible, but rather to allow map/geometry editing to be done dynamically in-game, to create fun gameplay and an elegant engine.

The engine supporting the game is entirely original in code & design, and its code is Open Source (ZLIB license, read the docs for more on how you can use the engine).

dot3 labs is a company started by the creators of Sauerbraten that offers commercial support.

Freedoom

The Freedoom project aims to create a complete Doom-based game which is Free Software. Combined with a free source port, people will also be able to play the back catalog of extensions made to Doom by hobbyists over the last 15 years. For more information, see the What is Freedoom? page.

Nexuiz

Nexuiz is a fast paced 3d deathmatch game project created online by a team of developers called Alientrap. It is available for download for Windows, Mac, and Linux (all the same archive).

The first version was released May 31st 2005, released entirely GPL and free over the net, a first for a project of its kind. Since then it has been downloaded over 1.5 million times, and the game is still being updated and developed, currently at version 2.5 and new releases being developed.

OpenArena

OpenArena is a Free Open content package for the id tech3 GPL source code package. But why is it a game? Well you see one of the great side effects of making content for a bunch of source code out there is that it becomes a playable game itself. This opens more opportunity for FUN to the end user because they have another option to play a game that you couldn't play without the data because now there is data made for it. And since this data created is also FREE, it's very redistributable. Meaning more people can play it with little effort on obtaining it. This is A Good Thing.

Tremulous

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. These structures provide many functions, the most important being spawning. The designated builders must ensure there are spawn structures or other players will not be able to rejoin the game after death. Other structures provide automated base defense (to some degree), healing functions and much more...

The Wolfenstein: Enemy Territory

The Wolfenstein: Enemy Territory FREE stand alone multiplayer game has been released to the world! It's fun, addicting and full of Wolf love! You don't need RtCW to play ET. What you need is what you download!

World of Padman

After years of being a Quake III: Arena Modification the World of Padman is now a standalone free game. World of Padman is a cool fun shooter, that includes 12 maps, crazy weapons, colorful player models, and fun game types.

Urban Terror

Urban Terror™ is a free multiplayer first person shooter, that (thanks to ioquake3) does not require Quake III Arena. It is available for Windows, Linux and Macintosh. The current version is 4.1.

Urban Terror can be described as a Hollywood tactical shooter; somewhat realism based, but the motto is "fun over realism". This results in a very unique, enjoyable and addictive game.