Burrows and Badgers is a set of free wargames rules for tabletop adventures with bands of anthropomorphic animals. There’s also a supporting set of miniatures.
Rules: Fantasy
Fields of Battle Fantasy Rules
If you have an account with Scribd, you may be interested in a set of fantasy rules that appeared in Warlock Magazine in 1986: Fields of Battle by Graeme Davis
BloodBowl Hockey Variant
Here’s a variant for Games Workshop’s BloodBowl Game in a hockey format.
Battlestorm Miniatures Combat System
Battlestorm is a set of free wargames rules for medieval fantasy.
La Guerre Des Ames (Souls Wars)
La Guerre Des Ames (Souls Wars) is a set of free wargames rules in which Angels and Demons fight for souls. The rules are in French, but if your browser operates the way mine does, it will automatically convert the text.