War Galley is a set of free wargames rules for ancient naval warfare. It very cleverly uses matchboxes and matchsticks for play.
ancients
Tom’s Ancient Warfare Rules
Tom’s Ancient Warfare rules are a set of free wargames rules designed to be played with — of all things — Risk pieces. The author notes that the bases may need to be larger if you use historical miniatures.
The Die is Cast – Rules For The Battle of Pharsalus (48 BC)
The Die is Cast is a set of free wargames rules For The Battle of Pharsalus (48 BC), a decisive engagement between Caesar and Pompey.
The Portable Wargame: Ancients
The Portable Wargame: Ancients is a set of free wargames rules for ancients wargames using a gridded surface and individually based figures. The Ancients version is one of several using the same system in different periods.