It's sort of a combination of Traveller and DnD, that's probably it. It uses HP and the normal six ability scores, and class.<br/><br/>I like it because the 'history' section is exactly how I use Traveler when I run, the History of a future Earth (a la Blade Runner or the Stars at War series) where space is colonized by the Earth's major governments and powerful corporations after jump drive technology is discovered, and Man hasn't discovered aliens yet (usually that discovery is in-game).<br/><br/>It's well done for a free game, but it does use some concepts that are from DnD.