xboot

XBOOT is a Windows-based multiboot ISO USB creator that lets you combine multiple Linux distributions, rescue tools, and diagnostic utilities onto a single bootable USB flash drive or multiboot ISO file. Similar to YUMI, it uses a simple drag-and-drop interface and supports both Grub and Syslinux bootloaders.

Quick summary: XBOOT is no longer actively maintained, but it remains a functional option for creating legacy BIOS multiboot USB drives. If you need UEFI support or active development, see the alternatives section below.