"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.
"There are both Windows and Linux versions of the game. According to John Diamond, the game's lead developer, Alien Arena has been downloaded more than 500,000 times since it was released two years ago. He guesses that about 10% of those downloads were of the Linux version, but notes that about half of the game's regular players are running the game on Linux.
I wrote last year that "Tremulous is the best free software FPS game I've had the pleasure of playing." Alien Arena has changed my mind about that. They're both great, and both stand on the shoulders of the free software Quake engine, but Alien Arena is now at the top of my list."