WinSetupFromUSB is a Windows program, which prepares multiboot USB flash or fixed disk to install any Windows versions.

MultiBootUSB is a cross platform software written in python which allows you to install multiple live Linux on a USB disk non destructively.

LiveUSB Install is a free cross-platform software for GNU/Linux and Windows, which helps you effortlessly install various Linux distributions and operating.

RMPrepUSB is the application you need if you want to create bootable USB drives.