From Elmar Hanlhofer:
Plop Boot Manager is a small program to boot different operating systems. The boot manager has a built-in IDE CDROM and USB driver to access that hardware without the help/need of bios. You can boot the operating systems from hard disk, floppy, CD/DVD or from USB. You can start the boot manager from floppy, CD, network and there are many more ways to start the boot manager. You can install the boot manager on your hard disk. There is no extra partition required for the boot manager.