Two Flags One Nation are a set of rules for do-it-yourself American Civil War board games. The author explains how he generates maps and block pieces with his computer.
American Civil War
American Civil War Campaign Rules
The DFW Grognards have published a set of ACW Campaign rules.
Give Them Cold Steel Civil War Rules
Give Them Cold Steel is a set of free wargames rules for the American Civil War.
54mm American Civil War Wargame Photos — The Wheatfield
These are photos from my friend Brad’s 54mm American Civil War game. The scenario was the Wheatfield from Gettysburg.
Ironclad American Civil War Naval Rules
From the Naval Wargames Association comes Ironclad, a set of free wargames rules for ACW ironclads.