Multisystem is an awesome tool created by LiveUSB.
There are many alternatives to MultiSystem for Linux if you are looking to replace it. The most popular Linux alternative is balenaEtcher, which is both free and Open Source. If that doesn't suit you, our users have ranked 32 alternatives to MultiSystem and 12 are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to MultiSystem are UNetbootin (Free, Open Source), MultiBootUSB (Free, Open Source), WoeUSB (Free, Open Source) and SARDU (Free Personal).