http://tremulous.net/
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| 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. 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...
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