Here’s a set of rules for converting the large scale Warhammer Fantasy battles game to a skirmish version.
Rules: Fantasy
Glave Fantasy Skirmish Rules
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.
Return to Lilliput 2.0 Battling Bigguns
Return to Lilliput 2.0 is a set of rules by Walt O’Hara in which, twenty years after Gulliver, a band of pirates arrives at Lilliput.
Mobius: Sonic The Hedgehog Wargames Rules
Mobius is a set of free wargames rules for game set in the universe of Archie Comics’ Sonic The Hedgehog series.
Update: Mobius now is in its second edition.
Twilight Small Scale Skirmish Rules
Hasslefree Miniatures has a trial set of their Twilight Small Scale Skirmish miniatures rules.