Alien Arena 2007 is a free/open-source first-person shooter game based on source code released by id Software. Started by COR Entertainment in 2004, the game combines a 1950s-era sci-fi atmosphere with gameplay similar to the Quake, Doom, and Unreal Tournament series. Alien Arena is primarily an online multiplayer action game, although single player campaigns are also available against bots.

Open Arena is a Quake 3 style First Person Shooter built on the GPL licensed Open Source Quake 3 engine. It's a stand alone game, so you don't need Quake 3 Arena to play it. Just like Quake 3 Arena, it's a full on, 3d FPS done in the traditional deathmatch style.

Today, COR Entertainment is scheduled to release version 6.10 of Alien Arena 2007, the popular free software, 3-D, first-person shooter built atop id Software's Quake II engine, which was released under the GPL in 2001. The new release of Alien Arena comes with seven new arenas, a better arsenal of weaponry, and a new game mode for one-on-one duels.

COR Entertainment announced Alien Arena 2008, a complete overhaul and update of the core game. Every player model has been replaced, nearly every weapon model, and nearly one half of the arenas. Sixteen new maps in total to be exact!

Alien Arena 2008, the followup to the game Linux.com proclaimed "blows away it's FPS competition" http://www.linux.com/feature/119775 is scheduled to be be released on March 1st, 2008.

I had the time to play yet another exciting game on my Linux box. It’s a free first person shooter called Urban Terror. The game is a total modification of the immensely popular Quake III Arena. It introduces many elements of the tactical shooter genre --team-driven gaming in more realistic environments.

John Diamond is the creator and lead developer of the popular free software game Alien Arena. He turned his hobbies and a talent for coding into a small business.

A first-person shooter (Commonly called FPS) is an action video game that involves "an avatar, one or more ranged weapons, and a varying number of enemies". FPSs render the game world from the visual perspective of the player character.

Version 7.10 of Alien Arena 2008 has been released by COR Entertainment today.