Warlord Games has a free version of its Blood Red Skies WWII Aircraft Rules.
Naval Action, by Lou Coatney, is a set of free wargames rules for miniatures battles in the World War II Pacific Theatre. The page also provides some markers to use in place of model ships.
Quick War is a set of free wargames rules for WWII games using 1:144 miniatures. From the BGG author's description:
This is a set of rules to play a WWII game with 1:144 miniatures. It doesn't use a lot of look up tables, and is easy to learn. That's why I call it "Quick War". This set of rules uses no game board, instead units are moved by measurements in inches, and rulers are used also for firing weapons. I use different colors of felt to denote hills, forest, water, and roads. Units may be hidden and put on opportunity fire, or be activated to move and fire. There are rules for artillery and infantry as well. Infantry may be used as artillery spotters, or to attack other infantry or armor. There is also Infantry support which includes heavier weapons such as bazookas.
In 1979, Steve Lorenz published Panzer War, a set of miniature wargaming rules for World War II microarmor. It was moderately successful, and in 1981, the second edition, Panzer War II was published. Having long since sold out, Steve has elected to offer these successful wargames rules free as a download.
Steve describes his set:
Panzer War is a set of war game rules simulating World War II armor warfare that will eventually use a variety of scaled miniatures. Currently it is scaled for 1/285 scaled models. Each player can assume the command of a platoon or company of troops. Panzer War includes rules covering weapons, vehicles and troops used during the conflict from 1938 through 1945. Warfare on and over the battlefield is simulated in a detailed and realistic manner. The scale being one vehicle model for one real vehicle and one infantry stand per infantry squad. The game may seem complicated at first once the basic rules are understood and experience is gained they will become second nature to the players. After familiarizing themselves with the basic rules players should move on to more advanced rules one step at a time.
And yes, there are a lot of charts and tables.
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