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.
Years ago, I played in a play-by-mail game called “Its a Crime.” In that game, you were in charge of a street gang and tried to wrest control of city blocks from the other gang leaders (players). These free wargames rules from the Lincoln Miniature Warfare Society allow you to do the same thing on the miniatures gaming tabletop.
Jim Wallman has posted the Lionel Tarr Rules for Modern Warfare on his website. Jim explains that these were
written sometime around 1959, these are as published in Don Featherstone’s original 1962 book ‘War Games’ – retyped and made available to nostalgic wargamers everywhere.
The Perfect Captain offers “Red Actions”, another in their series of superb free wargames rules. This particular set is designed for miniature wargames in the Russian Civil War. Like all of the Captain’s rules, these have superb graphics — but they are not just gratituous pictures. The thing that makes these rules so special is how tightly the graphics are integrated into the game system.
Majestic 12 games has these demo rules for their Grand Fleets miniature wargame. My group has played these and really enjoys them. Majestic 12 explains:
Grand Fleets is a comprehensive miniatures game of dreadnought-era naval warfare. In addition to rules for everything from ships to aeroplanes, Zeppelins to submarines, the rulebook includes:
Data cards for over 120 ships, plus guidelines for converting any ship of the period to game values; Eight scenarios encompassing conflicts from the Sino-Japanese War of 1894 through the opening salvoes of World War Two, including several variants; Fifteen pages of weapon data, covering all major gun and torpedo models in use through 1939, over 200 aeroplanes, and more than 20 airships; and Optional rules for flotillas, night-fighting, smokescreens, and more!