From Blood and Space Introduction:
Welcome to Blood and Space, a space adventure sourcebook for the d20 system. Not a complete game in and of itself, Blood and Space strives to provide players and game masters with a toolkit to supplement any science fiction campaign (or create a new one), with a special focus on starship combat and adventure. Within this toolkit you will find some new core d20 components such as base classes, skills, feats, and personal equipment. Also included in Blood and Space are extensive rules for constructing starships, playing crews, and a complete tactical space combat system. The rules that follow are presented ala cart, and game masters will want to choose which elements fit best into the theme of their particular d20 space game.