From Impact Games, Elfball is a set of fantasy “football” rules. It’s played on an oval field, so it’s not like “American Rules.”
Rules: Fantasy
Plastic Attack Rules For Action Figures
Plastic Attack is a simple set of free wargames rules for playing games with your plastic action figures.
Merlin Rouge
Merlin Rouge is a fantasy supplement for the You Are Still My Lord Wars of the Roses rules. Both rules sets at the link.
The Fantasy Trip Third Dimension
The Fantasy Trip Third Dimension is a set of rules modifications for The Fantasy Trip / Melee / Wizard that allows you to use Heroscape sets instead of cardboard counters. The three dimensions create some issues, but these solve them. You’ll need The Fantasy Trip to play, but if you don’t have a copy, you can make do with Legends, which is free from Dark City Games.
Melee and Wizard: The Fantasy Trip Mass Combat Rules
Melee and Wizard is a set of rules modifications to allow you to use The Fantasy Trip / Melee / Wizard for mass combat.