Install, Boot and Run multiple Operating Systems from a single exFAT formatted USB Drive.
Rufus - Rufus is a piece of software that allows you to transform a portable drive, like a flash drive or other USB drives, into a bootable drive that can be used for a variety of purposes. Read more about Rufus.
GRUB - Multiboot boot loader
Balena Etcher - Flash OS images to SD cards & USB drives, safely and easily.
EasyUEFI - Manage EFI/UEFI Boot Options & Manage EFI System Partitions & Fix EFI/UEFI Boot Issues
UNetbootin - UNetbootin is a utility for creating live bootable USB drives. The name of the software is short for Universal Netboot Installer, and its most prevalent use has been to create bootable versions of Linux distributions on a USB drive.
EasyBCD - EasyBCD is NeoSmart Technologies multiple award-winning answer to tweaking Windows bootloader.