Wandering Star is a set of free wargames rules for science fiction games with a Star Wars or Firefly vibe. From the author:
The design philosophy behind the rules is grounded in the idea that we want our sci fi games to feel like episodes of Star Wars or Firefly. This means that I deliberately tried to keep away from mechanics that model modern warfare. For example, weapon ranges are rather short (even though I know about the discussions surrounding this topic and would chose a different approach for historical games). Wandering Star is not supposed to force you to adopt modern small unit tactics, but to force you to behave like heroic rebel commandos in Star Wars!