Paul Leniston offers a set of free wargames rules for Napoleonics. He and his gamer wife have been playing and testing them for many years.
World War III Rules
World War III is a set of free wargames rules for the period “1950 to armageddon.”
One Page Kill Team
One Page Kill Team is a set of free wargames rules for small scale skirmishes in the 40K universe.
Free Dust 1947 Rules
Dust Models offers a free digital version of their Dust 1947 rules.
Into Glory Ride Wargaming Rules
Into Glory Ride is a set of free wargames rules for battles set in the Renaissance and beyond. It covers the era 1500 – 1900.