Red Army White Guards is a set of free wargames rules for the Russian Civil War.
Rules: 20th Century
Iron and Steam Rules
Iron and Steam is a set of free wargames rules for pre-dreadnought Victorian naval actions.
Iron and Steam is a set of miniatures rules for naval combat of the American Civil War. The rules feature a gun-by-gun combat resolution, written orders and simultaneous movement. Traditionally played with 1/600 scale models the combat scale is closer to 1/2400 scale, though the game is generally model scale agnostic. Also included are over 100 pre-filled ship record sheets, turning radii and arc-of-fire templates as well as a 2 page QRS to facilitate fire resolution.
Edwardian Splendor 54mm Rules
Edwardian Splendor is a set of free wargames rules for playing games with 54mm figures.
Sending MacDuff To The Front Rules
Ross MacFarlane offers a set of set of free wargames rules for the late 19th/ early 20th centuries called Sending MacDuff to the Front.
Quick Play Low Intensity Warfare Campaign Rules
Quick Play Low Intensity is a set of free wargames rules for playing campaigns set in Vietnam or similar conflicts.