Bob Cordery offers a set of Modified Morschauser 19th Century Rules. They’re based on the original set by Joseph Morschauser. It’s played on a gridded battlefield
The Napnuts’ Chew Boon Longe has a set of free wargames rules for western gunfights.
Island Mayhem is a set of rules for playing games in which 25mm – 28mm Pirates are searching for treasure.
American Civil War is a set of rules for 25mm figures in a 1:25 scale.
The Perfect Captain has upgraded the graphics for their free John Bull / Patriots game for the War of 1812 and the American Revolution.