Shake Loose The Border is a set of free wargames rules for skirmishes on the Anglo-Scottish border of the 16th century.
Hot Trod and Red Hand is a set of free wargames rules for sixteenth century Anglo-Scottish border warfare.
Border Reivers were raiders along the Anglo/Scottish border from the 1200s to the 1700s. Here's a set of free wargames rules for playing out these skirmishes.
From the mind of Rudi Geudens comes Renaissance Raiders, a set of free wargames rules for recreating conflicts along the Anglo-Scottish border. Based on the Command and Colors system, these are card driven, hex based rules designed for fast play.