The Battle Game of the Month Blog has the outline of a set of free wargames rules for playing games set in the Russian Civil War. They’re inspired by Joseph Morschauser’s rules.
Rules: 20th Century
Edwardian Splendor Wargames Rules
Edwardian Splendor is a set of free wargames rules for playing 54mm figures in the period 1880 – 1910.
Back of Beyond Campaign Rules
Tim’s Miniature Wargaming Blog has published some rules for his Back of Beyond campaign.
Return To The River Don
Return To The River Don is a set of free wargames rules for 15mm miniatures battles set in the Russian Civil War.
Battle of Tsushima Strait 1905
Here’s a set of free wargames rules for the Russo-Japanese war naval battle, Tsushima Strait, complete with printable ships.