John Armatys offers a set of Pike and Shot rules for fighting large, multi-player English Civil War battles.
rules
Two Page Lego Minifigs Rules Set
Consortium Games offers Minifigz, a two page rules set for battles with Lego minifigs, and similar mini people. I’m going to have to give this a try.
Update: The original link is dead. You can still find Minifigz on the Wayback Machine.
Crouching Hero Hidden Daggers
Jim Wallman presents yet another game in Crouching Heroes, Hidden Daggers: A fantasy skirmish based on the more fantastical type of chinese martial arts movie. With characters inspired by the Water Margin. Simple rules, with action cards
1-48 Combat WWII Skirmish Rules
1-48 Combat is a set of free wargames rules for WWII skirmish, designed for two players commanding a single squad.
Wars of the Roses Skirmish Rules
The Cool Guy or Dweeb site offers a set of Wars of the Roses skirmish rules.