Spanish Fury is a set of free wargames rules for European warfare in the 16th Century. The set includes rules for large and small scale land warfare, naval warfare, campaigns, sieges, galleys and piracy in the Caribbean.
Rules: Pike and Shot
Japanese Clan Wars Rules
An Honorable Victory is a set of free wargames rules for battles set in Japan’s 15th and 16th century clan wars. The author writes:
An Honourable Victory! are an abstract (but not too abstract) set of rules designed for the table-top wargaming of the Clan Wars of Japan during the 15th and 16th centuries.
After one or two games you’ll have them down pat.
Marston Less English Civil War Rules
Marston Less is a set of free wargames rules for fast play games of the English Civil War.
Dice For Honor Samurai Rules
Dice For Honor is a set of free wargames rules for Samurai Skirmishes.
Heroic Samurai
Jim Wallman offers Heroic Samurai, a set of free wargames rules for clan warfare in feudal Japan.