Army Dudes is a set of free wargames rules for playing games with the classic green army men.
Plastic Brigade is a set of fun rules for dollar store toy soldiers.
Army Men Combat is a set of one page miniature wargames rules. It’s designed for those ubiquitious plastic army men, but in truth could be used for anything.
Operation Sandtrap is a set of free wargames rules for standard Plastic Army Men.
Army Men: Plastic Conflict is a set of free wargames rules for those ubiquitous 54mm plastic army men. Interestingly, it has quite a bit of flavor background for the game.