Mothership: Player's Survival Guide

Mothership is a sci-fi horror roleplaying game where you and your crew try to survive in the most inhospitable environment in the universe: outer space! You'll excavate dangerous derelict spacecraft, explore strange unknown worlds, exterminate hostile alien life, and examine the horrors that encroach upon your every move. Choose from one of four classes:

Teamsters, the rough and tumble workers. More versatile at first level, Teamsters can be anything from engineers, to pilots, to asteroid miners. If Ripley from Aliens is your hero, then you'll want to play a Teamster.
Scientists, doctors, researches or anyone who wants to slice open aliens (or infected crew members) with a scalpel. Become an expert in genetics or xenobiology - or protect your crew from deadly viruses.
Androids are an exciting and terrifying addition to any crew. Powerful due to their supreme intellect, speed, and near-immunity to fear, they tend to unnerve other crew members with their cold inhumanity.
Marines are here to shoot bugs and chew bubblegum. They're handy in a fight, and better when grouped together, but be wary when a marine panics because it could spell doom for the rest of your crew.