SMART stands for Simple Miniature Adventure Rules and Tactics. They’re a set of free wargames rules for fantasy and medieval gaming.
rules
Coreheim: Mordheim Updated Rulebook
Coreheim is an updated rulebook for the venerable Games Workshop Mordheim system. I liked Mordheim (and its predecessor, Necromunda). I should get them out again to play.
Napoleonic Wargames Rules
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.