Glave is a set of fantasy battle rules that:
can be used with any style or type of miniatures. The system uses 6 sided dice to resolve all combat outcomes. Each player gets a certain amount of “training points” to train and equip his army with.
Miniatures Rules
Starcraft Tactical Miniatures Combat
The Starcraft Tactical Miniatures Combat rules are based on the world of the classic video game. I suppose you could use miniatures from the board game to play.
Shieldwall Dark Ages Rules
Legio Wargames offers Shieldwall, a set of free wargames rules for Dark Ages battles in the British Isles and Northern Europe.
Tacship Space Fighter Combat Rules
Tacship is a set of free wargames rules for space combat by John Tuffley. He writes:
Tacship is a simplified fast-play rules system for simulating combat between manned space fighters. The game may be played on a hex grid map or on a plain table area by substituting inches for hexes and measuring turns in 60 degree increments (the same as a one hexside facing change). Fighter models should be mounted on stands, preferably with a one inch hex base, if a grid is being used.
Modified Morschauser 19th Century Rules
Bob Cordery offers a set of Modified Morschauser 19th Century Rules. They’re based on the original set by Joseph Morschauser. It’s played on a gridded battlefield