Ventoy

Ventoy is an open source tool for creating bootable USB drives for ISO/WIM/IMG/VHD(x)/EFI files.

With Ventoy you don't have to format the drive over and over again, just copy the ISO/WIM/IMG/VHD(x)EFI files to the USB drive and boot them directly.

You can copy many files at once and Ventoy will give you a boot menu to select them.
Legacy BIOS and UEFI are supported in the same way.
Most supported OS types (Windows / WinPE / Linux / Unix / Vmware / Xen ...).