Welcome to the forum Matic!
The first group of stamps are US definitives.
The second and third groups are from the German Democratic Republic (DDR). The second group stamps are from the "Five Year Plan" series. Yours are all CTO's (cancelled to order).The third group stamps are Officials, all CTO's except for the 20pf second from the left.
As has been mentioned previously the last group of stamps are German inflationary period stamps.
All are interesting but do not have a large market value.
Dan
