Free multiplayer online first person shooter games software for linux

Alpha Shooter is a 3D OpenGL first-person shooter game with a sci-fi setting.
Alpha Shooter was born as a project for the Computer Graphics course at the University of Bologna.
The main objective was to develop a very simple 3D game using the OpenGL, GLU and GLUT libraries only (and some creativity). Emphasis was not placed on the game itself, rather on learning how to use the libraries to produce a 3D environment and interact with it; it was thus required to build a suitable scenery using polygonal meshes and quadric surfaces, appropriate textures and materials, lights, and effects.
According to my personal taste I chose a sci-fi setting, trying to reproduce an environment that could remind players of a warehouse or loading area located inside a space ship or space station, like those often seen in movies or commercial videogames (of course I was aware of the limits of my implementation). I focused development on a single room, with an outside view, for ease of development (it was my very first attempt at graphics programming) and because it was enough to make use of a wide set of elements of OpenGL, consistently with the project requirements.
The game I wrote was inspired to the First Person Shooter genre, in which the player can move around in a 3D environment, looking around freely through the eyes of the played character, interacting (in very limited ways) with some of the objects present, shooting crates and barrels and some holographic targets.
I had a lot of fun creating that simple game, so after I got my Masters Degree I decided it would be a waste to just leave it hidden in some obscure directory at home; it is now here, released as Free Software, so that I can keep working on it and improving it, with help from whoever will be interested, in the hope that it will be useful as an example on how to get started in computer graphics and games development.
Enhancements:
- Binary packages were created for all supported operating systems, including a Windows installer, an i386 Debian Linux package, and a PowerPC Mac OS X DMG disk image.
- Additionally, the improved persistent mouse movement mode uses a dynamic mouse cursor that shows direction and speed of rotation, making that movement mode more intuitive and useful.
- Several minor bugs have also been fixed.

Alien Blaster project is an action-loaded 2D arcade shooter game for up to two players.
alienblaster is an action-loaded 2D arcade shooter game.
Your mission in the game is simple: stop the invasion of the aliens by blasting them.
Simultaneous two-player mode is available.
Main features:
- many aliens to blast
- a big bad boss
- different weapons
- special items
- cooperative mode (2 players playing on 1 computer)
- gamepad/joystick support
- arcade mode with highscore
- open source
- published under GPL
- runs with Windows and Linux

Wolfenstein: Enemy Territory is a Multiplayer Online First Person Shooter. Wolfenstein: Enemy Territory is a team game; you will win or fall along with your comrades. The only way to complete the objectives that lead to victory is by cooperation, with each player covering their teammates and using their class special abilities in concert with the others.

Featuring multiplayer support for as many as 64 players, Wolfenstein: Enemy Territory challenges gamers to the ultimate test of teamwork and strategy. Each of the five character classes is critical to a teams ultimate victory or defeat on the battlefield. The Covert Operative class allows players to steal uniforms, perform reconnaissance and gain access to enemy positions. While, the Engineer allows the Axis and Allied teams to lay and diffuse mines as well as build battlefield bridges, towers, forward command bases and other improvements in the midst of combat to gain advantages for their team.

Wolfenstein: Enemy Territory further online players the option to slug it out in the intense Team Last-Man-Standing game mode, where squad-mates cooperate to ensure their team has the last surviving man on the battlefield. With new game modes, character classes, weaponry, and added tactical skills, Wolfenstein: Enemy Territory will keep gamers in the trenches for hours.

Enemy lines 7 is a single player first person 3d shooter game.

Shoot down enemy bombers threatening your city.

Marathon: Rubicon X is a first person shooter that continues the story of Bungies Marathon trilogy.

Marathon: Rubicon X is a free, cross platform, first person shooter that continues the story of Bungie’s Marathon trilogy. First released as Marathon:Rubicon in 2001, Rubicon X is a complete overhaul of the original.

It features all new high-resolution artwork, new and updated maps, and enough surprises to feel like a whole new game.

Installation:

To play Rubicon, download and unzip the archive below. When youre done, you should have a new directory called Rubicon X.

You will need the newest version of the Aleph One engine. Copy the application, Fonts, and Themes into your Rubicon X folder.