A Town Called Malice is a set of free wargames rules for wild west gunfights. The rules set was used by the North London Wargames Group for their 2015 club convention game.
Rules: 19th Century
OMOG Musket Rules
OMOG Muskets is a set of free wargames rules for small unit actions in the horse and musket era, 1700 – 1849.
Wild West Exodus Free Core Game Rules
Wild West Exodus is a skirmish game that mashes the 19th century American West with steampunk and horror themes. You can get the free starter rules here.
Mars Or Die Rules
Mars Or Die is a set of free wargames rules for Victorian era games set on Mars.
Schwerpunkt Rules for Warfare in the Age of the Rifle
Schwerpunkt is a set of free wargames rules for conflicts from the late 19th through the 20th centuries.. The author writes:
Schwerpunkt is a set of rules I designed myself before I bought CLA. Basically I asked myself what I wanted in a wargame and came up with the following criteria:
1) It had to be fast Playing
2) It should be capable of producing historical results
3) It had to be fun
With this in mind, I set about using all the rulesets I have ever played or read to come up with what I liked and didn’t like.