PLoP Boot Manager is a small program to boot different operating systems harddisk, floppy, CD/DVD or from USB. The interesting part about PLoP is that it can boot from an USB even without BIOS support so if you have an old computer with no BIOS USB boot support (and the same goes for CD/DVD) and want to install Linux (or Windows), you may want to give it a try. The boot manager itself can reside on a floppy, CD or on a network and you can install it on your harddisk. There is no extra partition required for the boot manager.

PLoP Boot Manager is not open source, but is free for personal and commercial use.