SharpBoot is described as 'Small utility for creating multiboot ISO or USB. You just need to drag-n-drop some iso files inside, and it automatically adds description and category (for supported ISO files, not shown in the screenshot). It uses Syslinux for the menu and bootloader' and is a bootable usb creator in the os & utilities category. There are more than 25 alternatives to SharpBoot for a variety of platforms, including Windows, Linux, Mac, Flathub and PortableApps.com apps. The best SharpBoot alternative is Rufus, which is both free and Open Source. Other great apps like SharpBoot are Ventoy, balenaEtcher, UNetbootin and YUMI exFAT.
Both support multiboot and UEFI to an extent