Mutants and Death Ray Guns is a possibility, if you like the "Song of..." rule engine.
I recently picked up AE: Bounty, and like the look of the rules. They seem versatile enough to handle Star Wars, if you don't mind a few rules "counts-as" substitutions (Jedi get melee stuff, and maybe a force-field represents their ability to deflect blaster shots, for example).
Back when I played Necromunda, we had a few Jedi warbands made using the Spyrer rules (specifically Jakara spyrers, who get the mono-blades and mirror shields). You could probably use other gangs to represent other Star Wars forces (Arbites as Stormtroopers, Orlocks as Rebels, so on and so forth).