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.
Slax is a Slackware-based bootable CD containing a Linux operating system, designed with a modular approach. Despite its small size, Slax provides a wide collection of pre-installed software for daily use, including a well-organised graphical user interface and useful recovery tools for system administrators.