Steve Winter and Jeff Perren offer a set of free wargames rules for simple, man-to-man skirmish in the Zulu War.
Lord Merlin’s Rules of Engagement
Lord Merlin’s Rules of Engagement is a set of free wargames rules for medieval style wargames. What makes these unique is that they are designed for large scale (70mm) figures. Despite the “Lord Merlin” monicker, there doesn’t seem to be a fantasy component here.
CthulhuTech RPG Rules
For those who like to get in on the ground floor, Wildfire Games has an open Beta Test of its new CthulhuTech RPG Core Book.
Living Dead Zombie Rules
Living Dead is a set of free roleplaying rules for the zombie apocalypse.