Free tremulous software for linux

Tremulous for Quake 3 Arena is an open source modification that blends a team based FPS with elements of an RTS. Players can choose from 2 unique races, aliens and humans. Players on both teams are able to build working structures in-game like an RTS.
These structures provide many functions, the most important being spawning. The designated builders must ensure there are spawn structures or other players will not be able to rejoin the game after death. Other structures provide automated base defense (to some degree), healing functions and much more...
Player advancement is different depending on which team you are on. As a human, players are rewarded with credits for each alien kill. These credits may be used to purchase new weapons and upgrades from the "Armoury". The alien team advances quite differently. Upon killing a human foe, the alien is able to evolve into a new class. The more kills gained the more powerful the classes available.
The overall objective behind Tremulous is to eliminate the opposing team. This is achieved by not only killing the opposing players but also removing their ability to respawn by destroying their spawn structures.
Main features:
- New flexible particle system for Q3 - can create smoke, water, fire easily in Q3 maps.
- 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 - dont like the weapon you have? Sell it and buy a different one, dozens of options.
Enhancements:
- New stand alone version -- Q3 no longer required
- New trail rendering system
- New tutorial system

GameQ project is a PHP game server query class.
GameQ is a PHP class for querying game servers (not master servers). It currently supports over 50 game types.
Features include player listing and sorting, easily expandable, modular design, error handling, and multiple string sending.
Enhancements:
- This release adds support for Alien Arena, Armed Assault, Battlefield 2142, Cross Racing Championship, Dark Messiah, Hexen 2, KISS Psycho Circus, Neverwinter Nights 2, Rag Doll Kung Fu, Red Orchestra, Savage, silverback engine, Stalker, Tremulous, Tribes (partial), and Tribes 2 (partial).
- It updates the main class to support query-response over the same socket, adds a filter example, and fixes Gamespy and Doom 3 player bugs.