I’m currently painting some of Wargames Foundry’s Plains Indians for a 7th Cavalry game. I found this site, with descriptions of symbols that the Native American warriors painted on their horses.
wild west
Simple Solo Wargames Rules For The Wild West
Mark Ainsworth offers a set of simple solo wargames rules for games of the 7th Cavalry against Plains Indians.
Tombstone RPG
Tombstone is a free RPG set in the wild west. It’s designed to be rules-light, and has quick play character creation to get you started.
Black Hat, White Hat
Black Hat, White Hat is a set of free wargames rules for Wild West skirmishes.
Dusty Trails Gunfight Game
Dusty Trails is a set of free rules for wild west gunfights.