Ventoy is a fairly new open source tool to create bootable USB drives using Linux or Microsoft Windows ISO files. You install this tool to a USB drive, then simply copy some ISO files to the USB drive and you can boot from it with no other changes (so without having to reformat the USB drive every time you want to create a bootable USB drive, and without having to extract the ISO file contents). When copying multiple ISO files to the USB drive, Ventoy provides a menu on boot from where you can choose which ISO to boot. You can even create a multiboot USB drive by adding ISO files for some Linux distributions and Windows ISO files on the same USB, as seen in the screenshot at the top of this page.