Clif’s 1490 – 1690 Rules are the author’s free wargames rules for the English Civil War, 30 Years War and other conflicts of the period.
Kensi Samurai Heroic Skirmish is a set of free wargames rules based on Games Workshop’s Lord of the Rings Battle game.
The older I get, the more I like simple rules sets. Here’s one for Samurai Skirmishes.
From the introduction:
Sensō is a skirmish game, 1:1 figure scale, for 25mm miniatures. One scale inch represents six feet and one turn roughly approximates one-two minutes. Bases should be square for foot, approximately one inch. Mounted can be 1” x 2”. The game is WYSIWYG (What you see is what you get); figures are armed and armoured as they appear.
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The Water Margin is a set of free wargames rules for oriental skirmishes.
David Heading offers a set of Renaissance Naval Rules.