Bar Brawling is a set of skirmish rules for wild west barroom brawls.
Rules: 19th Century
Black West Skirmish Rules
Black West is a simple set of free wargames rules for skirmishes in the Old West.
De Bellis Indica DBA Variant For 18th and 19th Century India
De Bellis Indica is a DBA variant for warfare in India in the 18th and 19th Centuries.
Horse and Musket DBA Variant
Here’s a Horse and Musket DBA Variant — primarily for Napoleonic and Seven Years War, but since the basic principles of war in that era covered a huge number of conflicts, you could adjust as needed.