MultiBootUSB is a cross platform software written in python which allows you to install multiple live linux on a USB disk non destructively and option to uninstall distros. Try out the world's first true cross platform multi boot live usb creator for free.

Simplify creating a bootable macOS installer.
Also compatible with macOS 10.13 High Sierra.

Create bootable install medium

Puppy Linux enables you to save money while doing more work, even allowing you to do magic by recovering data from destroyed PCs or by removing malware from Windows. See these example articles: recovering files from Windows and safe Internet banking with Puppy Linux.