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.
Trisquel GNU/Linux is a 100% libre Ubuntu-based Linux distribution. Its main purpose is to provide an operating system for varied audience, including home and office users, educational institutions, multimedia workstations, etc. The project is managed by independent developers and is partially funded by donations.