Hordes of the Empire is a set of free wargames rules for playing 19 century colonial battles. It’s a variant of Hordes of the Things (HotT), which itself is a variant of DBA.
rules
Napoleonic Campaign Rules Using Risk
Dale the Wargamer offers a set of Napoleonic Campaign Rules using the Risk board game.
Brickhammer Lego Wargames Rules
Brickhammer is a set of free wargames rules for playing wargames using Lego and minifigs.
Aquazone Game of Deep Sea Exploration and Combat
Aqua Zone is a set of free wargames rules for playing miniatures games that feature underwater combat with submarines, DSV’s and marine animals.
Faction Wars Science Fiction Skirmish
Fire and Forget Games has released a downloadable PDF version of the rules for Faction Wars, the sci-fi skirmish game. The free 40-page PDF contains the basic rules of the game, sample squads for two factions, and a couple of scenarios to get you started.