At https://www.simpsonslipways.com/virtual-sailor.html and at http://library.hangsim.com/browse.php?cat=5 you can download (modern) warships for both Virtual Sailor NG (VS NG) and Vehicle Simulator (VSF) for free from this library. But are there any other add-on libraries from which you can download many WWII-era warships for VS NG and VSF?
In naval war games like World of Warships and War Thunder you sail with WWII-era warships. But in these games it is all about shooting, fighting and destroying enemy ships, while your player ship with which you are sailing, is destroyed by enemy ships, which is very disturbing and annoying. And ship handling and manoeuvring is not very realistic in these games.