Doug Larsen has a nice article and scenario for fighting the battle of Helm’s Deep. He has obviously spent a lot of time studying the source material for both the maps and the forces.
fantasy
Netherhells Heroic Fantasy Rules
Heresy Miniatures offers a heroic fantasy game called “Netherhells.” It’s a dungeon-crawl game, with players facing a game master.
A Spot of Friendly Wizardry Rules
A Spot of Friendly Wizardry is a set of free wargames rules for battles between two or more wizards.
Gangs of Skavenblight
Gangs of Skavenblight is an Warhammer Fantasy adaptation of Footsore Miniatures’ Gangs of Rome Game. It features, as you might imagine, gangs of Skaven fighting for control of the city of the Horned Rat.
All of the links below are to pdf files.
An Hour of Valor Fantasy Skirmish Rules
An Hour of Valor is a set of free wargames rules for Fantasy Skirmishes.