MultiBoot USB
This is a collection of GRUB scripts that allows to create a bootable pendrive (USB dongle, flash stick) supporting a number of different OS images. Simply copy ISO files under `/iso-imgs`. Both UEFI and Legacy BIOS boot modes can be enabled simultaneously.
Plop Linux is a small distribution that can boot from CD, DVD, USB flash drive (UFD), USB hard disk or from network with PXE. It is designed to rescue data from a damaged system, backup and restore operating systems, automate tasks and more.