MultiBoot USB
This is a collection of GRUB scripts that allows to create a bootable pendrive (USB dongle, flash stick) supporting a number of different OS images. Simply copy ISO files under `/iso-imgs`. Both UEFI and Legacy BIOS boot modes can be enabled simultaneously.
boot.rackspace.com is a collection of iPXE scripts that allow you to rapidly network boot Operating Systems, Utilities and other tools very easily. It allows you the flexibility of booting installations without having to go track down and download installation media. It’s especially useful for remote access environments when you don’t want to utilize remote attach CD in a Dell DRAC, HP iLO or some other type of remote tool. It’s especially awesome for bootstrapping your own custom installation on a Cloud Server!