Full Thrust is a game for fleet combat in space. It is set in the same background as Star Grunt II, but like Star Grunt it is made in a way that you can build and adjust models for whichever background you like.
The rules are available for free from Ground Zero Games.
I discovered the rules around ~2014 or so IIRC (I am getting old…), have a quite substantiol fleet of NSL and NAC (all unbuilt and unpainted, of course), and never actually played the game… yet. Will report back… eventually…