Here are some interesting thoughts on playing Song of Blade and Heroes solo.
Bar Brawling is a set of skirmish rules for wild west barroom brawls.
Dirty Labs and Dangerous Jungles is a set of pulp extensions for the free Wild West Skirmish Set, Black West. Both can be found on this page.
Isildur’s Bane is a set of free wargames rules for playing solo games of the Lord of the Rings Battle Game.
Black West is a simple set of free wargames rules for skirmishes in the Old West.