The Square Brigadier is a set of horse-and-musket rules based on Bob Cordery’s Chess board game inspired by Joe Morschauser.
Guilford Court House Order of Battle and Scenario
A Miniature History of the American Revolution has orders of battle for Guilford Court House, the famous battle in the Southern Campaign of the American Revolution.
Battlelore Napoleonics
Battlelore Napoleonics are a set of adaptations of the Battlelore Fantasy/Medieval card driven miniatures/board game. I like the Battlelore system a lot.
Beware: this site has an obnoxious pop-up video ad embedded in it.
American Revolution Flags
A Miniature History of the American Revolution blog has a set of printable flags for the Continentals.
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.