MultiBoot USB
This is a project that contains a collection of GRUB files and scripts that will allow you to create a pendrive capable of booting different ISO files.
Container Linux (formerly CoreOS) is a Linux-based operating system for servers. Built from the ground up and designed primarily for the modern data centre, Container Linux provides specialist tools for making the system secure, reliable and up-to-date. Some of the more interesting features of the distribution include reliable updates and patches via FastPatch, a dashboard for managing rolling updates via CoreUpdate, a docker for packaging applications, as well as support for bare metal and many cloud providers.