American Civil War Riverine Actions is a set of free wargames rules for ironclads, tin-clads, cotton-clads and all the fun and unique ships that plied the rivers of the United States during the ACW.
ACW
The Revised Brom ACW Rules
The Revised Brom is a set of free wargames rules by Jay Ainsworth for wargames set in the American Civil War. They’re based on an original set of Larry Brom rule (duh). It uses a typical Brom card activation system, a random movement distance mechanism, and simultaneous fire.
See The Elephant American Civil War Rules
See The Elephant is a set of free wargames rules for the American Civil War played on a chess-like grid.
A Hotter Fire ACW Naval Rules
A Hotter Fire is a set of free wargames rules for naval combat between civil war ironclads.
Two Flags One Nation Board Game Rules
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.