Fighting Fantasy Blog has published a set of “Fighting Fantasy Mass Battle” rules from a 1986 issue of Warlock magazine. Ahhh … such Old School Goodness.
Battle Companies is a fan created book of Lord of the Rings Battle Companies.
Reaper Minis offers a set of quick play rules called Warlord, designed for their figure lines.
City Grounds is a fantasy skirmish game in the vein of Mordheim, but with different mechanics.
Fire At Will is a set of free wargames rules for 6mm fantasy battles.