An Hour of Valor is a set of free wargames rules for Fantasy Skirmishes.
medieval
Medieval Castle Siege Rules
Junior General has a simple set of Medieval Castle siege rules. The site also has links to appropriate paper figures, castle models and siege equipment.
D3 Norman Conquest Rules
The D3 Norman Conquest rules are designed as a set of low-complexity rules based on One Hour Wargaming rules and Dux Bellorum. It uses a square gridded tabletop.
Early Blazon Heraldry Site
Early Blazon offers illustrations of hundreds of coats of arms through the Crusades.
Castle Cracker Medieval and Ancient Warfare Rules
Castle Cracker is a set of free wargames rules for backyard games in the ancient and medieval eras.