AirWar 1940: WW2 air combat rules (1939-1945)
By Sea and By River
Bulldogs Away!! Fast Attack Craft Rules for the Period from 1950
White Bear Red Sun
Broadside and Salvo
The Balkan Naval War
AirWar: C21 bomber annex
At the Height of Battle
Incredible Voyages: Undersea Combat in the Victorian Age
Narrow Seas! Fast Play Tactical Naval Rules for WWII Coastal Forces Actions
Warships of the Russo Turkish War
An Object Lesson to the Kaiser