Yumi (Pendrivelinux.com) offers to be the successor of the MultibootISOs program.
I also found Sardu (sarducd.it), it is MORE GUI then the GUI of Yumi, and also offers more implicit support for Windows-based ISO's.
Both programs come with download link and a list of confirmed distributions that work.
Placing all ISO's in Yumi's executable folder should add them all in once, but I got adding multiple iso's only working with Sardu. I asked support, for documentation contradicts...
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