Mac users interested in Unibeast 6. generally download:
UniBeast is a simple application that allows you to create a bootable USB drive from any Mac App Store purchased copy of OS X. This all-in-one bootable USB drive can also be used as a rescue boot drive for system recovery. This app has an intuitive interface.
UNetbootin allows you to create bootable Live USB drives for Ubuntu, Fedora, and other Linux distributions without burning a CD. It runs on Windows, Linux, and Mac OS X. You can either let UNetbootin download one of the many distributions supported out-of-the-box for you, or supply your own Linux .iso file if you've already downloaded one or your preferred distribution isn't on the list.