Shooter with Strategy Elements
Tremulous is a free, open source game that blends a team based FPS with elements of an RTS.
Players choose from 2 unique races, aliens and humans 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…
Different Advancements for Each Team
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 "Armory". 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. Do this by killing opposing players or destroy their spawn structures.