For a limited time, Warlord Games is offering free digital copies of Black Powder, Hail Caesar and Pike & Shotte
Unheroic Samurai is a set of free wargames rules for combat with classical Samurai versus undead horrors.
Naginata is a set of free wargames rules for samurai skirmishes.
Legends of the Rising Sun is a collection of special rules and unit lists for using Legends of the Old West/Lord of the Rings rules for samurai. From Wargames Illustrated 278. Direct PDF download of Legends of the Rising Sun.
From Ebob miniatures, a set of miniature wargaming skirmish rules for the Scottish Rebellion of William Wallace in 1297 called Rebellion