TREMULOUS 1.1.0

Tremulous is a free, open source game that blends a team based FPS with elements of an RTS. Players can choose from 2 unique races, aliens and humans.

Feature List

• Flexible particle system - 99% of the in-game visual effects are configured using particle scripts.
• 16 buildable structures with in-game functions.
• Play as several alien classes with unique abilities.
• Customize your setup as a human and buy new weapons, armour and items.
• Scale the walls and ceilings as an alien waiting for an unsuspecting human.
• Realistic physics and motion - no bunny hopping or quick back peddling.
• Flexible map system - animated mapobjects, triggering, light flares, etc.
• Large weapons system - don't like the weapon you have? Sell it and buy a different one, dozens of options.

Open Source

Tremulous is open source, licensed under the GPL. Tremulous is open source and the source code is available to the public, along with the binaries. It allow other developers to utilise sections of this code in their own works, should it be useful to them. It should be noted however, that using the source makes your work to also be covered by the GPL and hence be open source itself. Tremulous is built on the ioquake3 game engine, which is a development of id software's GPL release of the Quake III Arena source code.

Technical aspects of these games can be discovered by reading the manuals, which can almost always be found in the manual section when we go the the respective site.
e.g:
We can find some technical aspects of how Tremulous works in Section 3 of the manual which can be found in http://tremulous.net/manual/.

Link to download this game:
http://tremulous.net/files/