La Felissima Armada is a set of free wargames rules for naval skirmishes between England and Spain in the Elizabethan Age.
Miniatures Rules
Battle of Granicus
The Junior General offers a set of fast play rules as well as paper figures for the Battle of Granicus, in which Alexander The Great took on the Persian Empire.
Advanced Virtus Ancients Rules
Advanced Virtus is a set of free wargames rules for ancient warfare. They’re described as “fast and furious.”
And One For All
And One For All is a set of free wargames rules from Eureka Miniatures for swashbuckling adventure in the tradition of the Three Musketeers.
Pz8 Wargames Rules
This 24 page pdf has Pz8’s relatively simple free wargames rules for a variety of periods, including
Colonial
WW1 Divisional
WW2
WW2 Divisional
1939 – 1941 Naval
WW2 Coastal
1935 – 1965 Aerial
1965 – 1075 Aerial
1950 – 1975
1975 – 2010
Science Fiction
Space Combat