Loose Files and American Scramble by Andy Callan was one of the first American Revolution games that I played. Originally published in Wargames Illustrated in 1987, it is a lot of fun.
rules
Dinosaur Cowboys
Dinosaur Cowboys is a set of role playing / miniatures rules that reminds me of the old comic Cadillacs and Dinosaurs. It looks like a lot of fun.
Rifle and Kepi 19th Century Rules
Martin Rapier offers Rifle and Kepi, a set of free wargames rules for large scale battles of the 19th Century.
The Water Margin Samurai Rules
The Water Margin is a set of free wargames rules for oriental skirmishes.
WWII Plastic Skirmish
Brett Drake offers a set of rules called WWII Plastic Skirmish, which are — obviously — rules for playing WWII games with plastic army men.
What more could you want? Your favorite childhood toys. Dice. Mayhem.