Apps with 'Multi boot' feature

Ventoy is an open source tool to create bootable USB drive for ISO files. With ventoy, you don't need to format the disk again and again, you just need to copy the iso file to the USB drive and boot it.

The YUMI exFAT (Your Universal Multiboot Installer) media creation tool can be used to automatically create an exFAT bootable USB flash drive containing multiple operating systems, antivirus utilities, disc cloning, diagnostic tools, and more.

Flexible and configurable USB drive multiboot solution which also supports UEFI booting.

SARDU (short for Shardana Antivirus Rescue Disk Utility) creates a multiboot all-in-one USB drive, CD or DVD for free (personal and non commercial use). Hard disks, external hard disks and all removable media are supported.

Boot-US is an universal boot manager. It allows you to easily use of all your existing operating systems completely independent of each other. The boot manager can be comfortably installed directly under Windows.

BootIt Bare Metal is a boot manager and partition manager software utility. Whither you want to do non-destructive repartitioning or boot multiple operating systems, this is the product for you.

Written in C++ and licensed under GNU GPL, XOSL (eXtended Operating System Loader) is a user-friendly, window-based graphical boot manager handling large disks and over 30 different operating systems.

SharpBoot is a 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.