A Town Called Malice is a set of free wargames rules for wild west gunfights. The rules set was used by the North London Wargames Group for their 2015 club convention game.
skirmish
The Games: Blood and Spectacle Gladiator Rules
The Games: Blood and Spectacle is a set of free wargames rules for gladiatorial combat in ancient Rome.
One Man One Gun Rules For Plastic Army Men
One Man One Gun is a set of free wargames rules for plastic army men.
Combat Action Science Fiction Rules
Combat Action is a set of free wargames rules for science fiction skirmishes. The author writes
Combat Action is a strategy game of small-scale conflicts. It can be used to simulate skirmishes with a dozen models per side or larger conflicts with multiple squads, vehicles and support weapons. The system presented in this book comprises two levels of detail: a system for small scale games where each model on the battlefield is a separate unit, and a second layer which adds rules that govern targeting, simulate chains of command and allow for larger engagements of forces. The point system will allow you to design any creature, vehicle or model you like and field any model you create on the battlefield. These rules are designed with the 25 to 30mm scale of miniatures in mind. Converting it to other scales of miniatures should not be a problem however, since there are few explicit range measures involved.
Over The Hills And Far Away Napoleonic Skirmish Rules
Over The Hills and Far Away is a set of free wargames rules for skirmishes in the Napoleonic Era. The rules are designed with a cinematic bent, and intended for up to six players each controlling up to eight figures.