Richard Bradley offers a set of Pike and Shot Skirmish rules.
Rules: Pike and Shot
Renaissance Naval Rules
David Heading offers a set of free wargames rules for Renaissance Naval Battles.
Victory Without Squares
Victory without Squares is a modification of the Victory without Quarter English Civil War Rules System. Both are free wargames rules, with the “without squares” version using inches, rather than squares for movement and range.
Escaramouche Pike and Shot Era Skirmish Rules
Escaramouche is a set of free wargames rules for skirmishes in the Pike and Shot era. It’s designed to be played with perhaps six figures per side.
No Dachi Samurai Skirmish Rules
No Dachi is a set of free wargames rules for Samurai skirmishes.