Quick Intermediate Level Skirmish is a set of free wargames rules for battles with small force sizes. It is multi-genre and designed to be simple.
universal
Marathon To Marne Pre-Machine Gun Rules
Jim Gandy offers Marathon To Marne, a set of free wargames rules for games from ancient times to the widespread deployment of the machine gun.
Instant Roleplaying Game
The Instant Game:
is a tool for creating and playing new RPG settings on the spot.With the Instant Game charts and our flexible Instant Game rules set, you can roll up a completely original setting and plot, create and develop characters “on the fly” and be ready to roleplay in just a matter of minutes.
Slammer SF Rules
Tired of Warhammer 40K? Try Slammer a set of free wargames rules by Chris and Alex Nicole. The rules set is not tied to any particular set of science fiction miniatures, and there are army lists for a wide variety of troops — even Zulus! ??? (For those hordes of primitives versus superior technology games).
MEST – Adventures in Matter, Energy, Space and Time
MEST – Adventures In Matter, Energy, Space and Time is a set of free wargames rules for cinematic skirmish games. The authors write:
Matter. Energy. Space. Time. The MEST Narrative miniatures rules system is designed to be a flexible light-weight set of features that can work with numerous genres such as Swords & Sandals, Medieval, Swashbuckler, Wild West, Horror, Victorian Adventure, Pulp Heroes, Modern Battles, Future War, Sci-Fi, or Superheroes.
With these rules two or more players can simulate the last exciting minutes of derring-do, harrowing deeds, and heart-stopping acts of courage of any small-scale engagement pulled from any number of genres; from penny novels, serials, and otherwise. Will the dastardly villains win? Will the heroes prevail? Who lives? Who dies? The answers to these questions and more await your decision!