HOTiSO, well known group who releases Mac stuff, released this app for Mac users of course. It’s for diagnostic / repair purposes, something like Hiren’s BootCD what we have on Win side (or any other bootable diagnostic tool, you name it).

Description: Protogo allows u to quickly create a bootable diagnostic device that contains Micromat’s most powerful tools as well as any of your own utilities u may wish to install. You can then use this device to boot, check, maintain, and repair Macintosh computers as needed.