Close Action is a set of free wargames rules for squad level WW2 actions.
WWII
Focused Firepower WWII Rules
Focused Firepower is a set of free wargames rules for playing WWII skirmish games. The authors write:
Focused Firepower is a scenario-driven 1:1 wargame designed for use with 1/72 scale miniatures. We have endeavoured to offer an in-depth game system with the focus on realism, but the system we have developed is easy to learn and games flow well.
As a 1:1 system the models you have on the tabletop represent the exact troops and vehicles. The majority of other game systems use a more abstract method where one unit actually represents several, or where entire units are modelled on a single base and dealt with as a whole. We found that our method provides a more accurate and realistic impression of real warfare.
By focusing our game on realism we have found that real-world tactics work just as well on the tabletop and we highly recommend reading the fantastic range of WWII tactics books published by Osprey.
WWII Naval Rules
Here are a set of WWII Naval rules created by the author for playing with his homemade WWII ships.
Panzerschlacht WWII Rules
Panzerschlacht is a set of free wargames rules for WWII micro armor. The author writes:
This is the World War 2 version of AToS. It uses exactly the same game mechanisms and, apart from the weapon factors, the only difference is that the ground scale has been increased to 1mm = 1 metre to allow for more aesthetically pleasing ranges.
In our games we mark all casualties on the vehicle and figure bases. This allows a paperless game with no book-keeping whatever. By allowing the models to represent more than one vehicle it becomes possible to field an entire panzer division on an eight by six foot table.