There have been a few takes on roleplaying in Star Wars setting, a few official ones anyway; you could always use any old system if you felt like handling the deviations wrought by its approach to stellar conflics, and I know people who do that. Knights of the Old Republic was essentially a re-skin of D&D, after all. I had the old West End version, of course, with its attendant brick of six siders. I've owned and played fully two different approaches from Wizards of the Coast, including the Saga edition, which some people considered a precursor to the much beloved/universally reviled Fourth Edition of Dungeons and Dragons.