S Scale is the railroad scale that most nearly approximates the 25mm – 28mm figure scale. Unfortunately, until recently it has been rather obscure, difficult to find at even the best stocked hobby store. This website has a vast list of S scale resources.
The Miniature Wargaming Editor
Napoleonic Squares Rules
Napoleonic Squares is a set of free wargames rules for the Napoleonic Era from Steve’s Painting Shed.
Alien Invasion Rules
Matakishi has a set of free skirmish rules called “Alien Invasion”. The author writes:
This is a skirmish level game designed to be played by four to six players in about an hour and a half. Each player will control a competing faction with personal victory conditions to achieve based on the scenario chosen. Not all victory conditions are mutually exclusive so alliances and diplomacy have their place.
The game is ostensibly set in a fictional present day but this is not a requirement. Many of the factions are drawn from popular culture and new factions can be added very easily simply by quantifying a small number of variables.
The game requires minimal measuring, no charts and a lot of six sided dice. The rules will be memorised by a player by their second action and everyone can then concentrate on having fun.
Urban Warzones Rules
Urban Warzone is a set of free wargames rules for near-future urban combat in a post-apocalypse world.