Though BF players usually hate valve and steam like no other, this mod is awesome. It's a Space combat mod where you have to board the enemy ship/base to take the "Subsystems" (Basically like flags in BF) and keep yours safe to win. The space gameplay rocks like mad but sadly it's still beta and lags like squeezey pooh every now and then, and the infantry combat is too deathmatch style. Still, it's really fun and the Space gameplay is really awesome and will get much better as they say it's still "a really early version."
Site: http://www.eternal-silence.net/index.php

EDIT: *test* squeezey pooh squeezey pooh smurf smurf*test* Haha, cool.