A Miniature History of the American Revolution blog has a set of printable flags for the Continentals.
The Miniature Wargaming Editor
Pz8 Coastal Rules
Pz8 is a series of two-page wargames rules. Among them are is a set of free wargames rules for coastal actions.
Giant Stompy Robots Rules
Meca Tac – The Giant Stompy Robots Edition is a set of free wargames rules for Mecha battles.
American Western Frontier Photos
For Wild West fans, here are a bunch of period photos of the American West.
King Of War Historical Ancient Battles
The Hour of Wolves and Shattered Shields site has a set of free wargames rules for Ancients Battles based on the free set of fantasy wargames rules called Kings of War.