Tremulous

Tremulous is a multiplayer first-person shooter licensed under the GPL. It's media is licensed under the Creative Commons Attribution-ShareAlike license version 2.5. The game is inspired by the Quake II mod Gloom.

Tremulous uses the ioquake3 engine which is based upon id Tech 3. The latest version of Tremulous is 1.1 and was released on March 31, 2006. Although version 1.2 was highly anticipated and a gameplay preview was released, development has been stale since. The fork Unvanquished is the most current.

Gameplay
Players either play on the alien or on the human team. Humans rely on technology and equip various weapons to dispose of their alien adversaries, while the aliens rely on evolving to become larger and fitter monsters.

Base building plays a crucial role in Tremulous. Machine turrets and the armory (human) and acid tubes and boosters (alien) are some of the available buildings. Each base is controlled by a main structure: the human reactor and the alien overmind power the other buildings, so defending one team's main structure and destroying the enemies' is a main task of the game. A team has to destroy all enemy's spawn points and players to win.

Alien team
As an alien, most fighting is close-combat, with the exception of Grangers, and Dragoons who can spit projectiles. Evolution points are spent on evolving into stronger units with special abilities. Those include walking on walls, paralyzing the enemy or shooting projectiles.

Human team
Human players use weapons and items to kill. Money is spent at the armory building to buy guns, armor and other equipment.

Forks

 * Tremfusion
 * Unvanquished