What is the value of World War 2 money of countries that are no more?

The value of obsolete currency and coins depends on several factors. If you mean coins, they sometimes have a metal content that has value, if they are silver or copper. This is "melt value", for the intrinsic worth of their metal content. These items may also have collectible, numismatic value. The price they might bring would depend on their condition, and their scarcity. The market for such items can be thin, and, in the end, the value of such items is what somebody has just paid for them. Some Nazi German coins of silver always sell, but they also made some of zinc that get this white residue all over them and they do not sell, unless perfectly preserved.

You could always try listing them on eBay. Good pictures or scans help sell there. Unless the items you have are in perfect, pristine condition, they are unlikely to be worth any significant sum.