Star Cruiser Lite is based on GZG’s Full Thrust and intended for space combat games in the 2300ADÂ universe.
science fiction
Battleshift Space Fleet Combat
Battleshift is a set of space fleet combat rules for big fleet battles.
Lights In The Sky Starship Battles
Lights in The Sky is a set of free wargames rules for space battles.
Trenched Rules
Trenched is a set of free wargames rules for squad level combat. In spite of the name, it is not a WWI rules set. The example photos are of Warzone science fiction figures.
Boonta Eve Classic Podracing Rules
Boonta Eve Classic is a set of free wargmes rules for pod racing in the Star Wars Universe. The rules are designed for use with those old Galoob Micromachines, which can still be had for a reasonable price on Ebay: