Bricks Only Wargame is a set of free wargames rules for wargames using Lego bricks.
Rules: General
Tac Ant Combat Simulation
Tac-Ant is a set of free wargames rules for battles between hills of ants.
Seriously.
Can My Soldier Shoot Yours Daddy?
Can My Soldier Shoot Yours Daddy? is a set of free wargames rules for wargaming parents to play with their toddlers.
Warblocks Rules
Warblocks is a set of free wargames rules using Jenga blocks as troops.
Rabbidgerbal Wrestling!
Rabbidgerbal Wrestling! is a set of free rules for professional wrestlers in a ring.