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.
The DFW Grognards have published a set of ACW Campaign rules.
Give Them Cold Steel is a set of free wargames rules for the American Civil War.
These are photos from my friend Brad’s 54mm American Civil War game. The scenario was the Wheatfield from Gettysburg.
From the Naval Wargames Association comes Ironclad, a set of free wargames rules for ACW ironclads.