The folk at the Flames of War offer “Open Fire,” a set of quickstart rules for 15mm WWII gaming.
World War Two
PZ8 WWII Micro Armor Wargames Rules
PZ8 WWII is a set of free wargames rules for fighting battles of the Second World War using 6mm (microarmor) wargames miniatures.
PZ8 1950-69 6mm Wargames Miniatures Rules
PZ8 1950-69 is a set of free wargames rules for using 6mm miniatures to refight battles of the mid to late 20th century.
Kampfgruppe Ost WWII Rules
Kampfgrupp OST is a simple Hex based Operational level WWII game circa 1944-1945 East front.
Operational Art WWII Rules
Operational Art is a set of free wargames rules for refighting WWII’s eastern front on an operational level scale.