Chris Kemp has a mini campaign for his Not Quite Mechanized rules.
Rules: WWII
Battle of Britain Rules and Playing Pieces
The Battle of Britain is a complete strategic game for refighting the epic battle of 1940.
Red Poppy, White Feather Skirmish Rules
Red Poppy, White Feather is a set of free wargames rules for WWII Skirmishes.
In Clouds of Glory
In Clouds of Glory is a set of free wargames rules for World War One aerial combat.
Final Round WWII Rules
Final Round is a set of free wargames rules for World War II infantry combat games.