ACP offers Valkyrie, a set of free wargames rules for science fiction company level games.
rules
Ancients D6 Version 3
Ancients D6 is a very nice looking set of Ancients rules. They also have extensive army lists. From the introduction:
Gone are our days of playing complicated simulations. Most of my friends and I do not have nearly the time to play long and complicated rules systems. I love Ancient and Medieval warfare and was looking for the perfect game. I have bought and tried many of the games on the market and found different things:
· Games were needlessly complicated.
· Games were so simple that they were not very rewarding.
· Games were not well thought out.When playing some games, a certain amount of math is required. Simple math done over and over again for hours at a time can be quite tiring. Too many modifiers will wear a person out in no time at all. So our challenge was to:
· Design a game that can be played in 1 or 2 hours
· Provide simple game mechanics to minimize the math calculations
· Provide an easy to follow game turn
· Allow for the nuances the different armies of antiquity
Eagles and Emperors Napoleonic Rules
Eagles and Emperors is a set of free wargames rules for the Napoleonic period based on a set of Civil War rules called The Blue, The Grey and the Butternut.
State of War ACW Skirmish Rules
Richard Bradley’s State of War ACW Skirmish Rules are available at the Tyneside Wargames Club site.
Castles, Cogs & Chevauchées
Castles, Cogs & Chevauchées is a set of campaign style rules for skirmish level combat using the Knights and Knaves skirmish rules.
Knights and Knaves rules at the same link