Tremulous is a total conversion for Quake III: Arena that blends real-time strategy elements with first-person combat in a futuristic setting. Players may fight as either aliens or humans, choosing between dozens of unique abilities or helping their team by constructing bases out of a multitude of buildable structures. Tremulous also makes several enhancements to the the Quake 3 engine including a powerful particle system, an enhanced head-up display, and a flexible map system including animated mapobjects and light flares. These changes and the rest of the Tremulous source code are made available to the public under the Open Source Mod License.
The manual can be read online.Tremulous 1.0 Download: [ tremulous.net ]