You may have such needs: to create a multi-system bootable USB drive or ISO image; to install multiple operating systems via a single USB storage device; to boot and direct run, use multiple operating systems from only one USB drive; to create a Live Linux CD or Rescue CD, and so on. If it is a similar situation, then XBoot can meet your requirements.
YUMI (short for Your Universal Multiboot Installer) is the successor of MultibootISOs, a free, open-source, powerful and user-friendly USB installer maker. It is used to create multi-system bootable USB devices, which can boot multiple operating systems, antivirus programs, disk cloning tools, system diagnostic tools, and more.
SARDU MultiBoot Creator is a multi-boot device builder developed by Davide Costa from Italy. It supports any kinds of storage devices or media, such as internal or external HDD/SSD, USB flash drive, CD/DVD, memory card, and more. It’s free for personal and non commercial use.