Rattrap Productions has a set of free downloadable demo rules for its .45 Adventure miniatures rules. There also are a number of free scenarios.
Jim Wallman has written a set of rules called Go!Go!Go!, which he says is loosely based on the computer game “CounterStrike”.
Peter Pig’s AK 47 Republic rules are a lot of fun as a campaign game. Set in the turbulent near once and future Africa, there are rules for designing an army, political maneuvering, morale, adn more. Its your chance to run your own little despotic African nation.
But I’ve always thought that the combat rules were a little lacking. Or maybe its just better tos ay that they just aren’t to my style.
Apparently I’m not the only one who had this thought. Steven Thomas has written a set of guidelines for converting AK47 Republic forces to the Crossfire rules by Arty Conliffe.
Wargamer and Teacher Matt Fritz has written MiG Madness, a set of free wargames rules for playing air combat in the Korean War.
The Hot Lead and Steel Sinews Yahoo group focuses on pulp-era gaming. There are also a set of playtest rules for the period, called “Noir.” Unlike other adventure-miniatures games, this set of free wargames rules is specifically focuses on the period, featuring such things as “hero points” to capture the flavor of the pulp novels.