Nothing surprising here. Most of these images seem to show concepts or variations of concepts of the later stages of WW2 from Horten/Gotha, Heinkel, Messerschmitt etc.. However all of these aircraft remained on the drawing board. Some of them may have had influence on post war concepts though, since the allies seized all the work while occupying Germany.
Similar research was conducted in the other countries as well, out of desperation however the german concepts experienced quicker deployment and development into usable aircraft.