Mike Callan offers this set of free wargames rules for American Civil War Ironclads. The set originally was published in Wargames Illustrated 14.
rules
Trireme Ancient Naval Rules
Trireme, from Andy Watkins, is a set of free naval wargames rules. These are of the one-page variety, which means that there is much to recommend them. I also like the staggered movement system based on boat speed, which reminds me of the old Car Wars system.
BloodBowl Hockey Variant
Here’s a variant for Games Workshop’s BloodBowl Game in a hockey format.
Boonta Eve Classic Podracing Rules
Boonta Eve Classic is a set of free wargmes rules for pod racing in the Star Wars Universe. The rules are designed for use with those old Galoob Micromachines, which can still be had for a reasonable price on Ebay:
American War of Independence Wargames Rules
American War of Independence is a set of free wargames rules based on Neil Thomas’ Napoleonic Wargaming and Ancient and Medieval Wargaming. Interestingly, all movement is based on “base widths.”