MultiSystem is described as «awesome Linux tool for creating multiboot USB drives, developed by FranГ§ois Fabre (http://liveusb.info/dotclear/)» and is a bootable usb creator in the cd/dvd tools category. There are more than 25 alternatives to MultiSystem for a variety of platforms, including Windows, Linux, Mac, PortableApps.com and Wine. The best alternative is Rufus, which is both free and Open Source. Other great apps like MultiSystem are Ventoy, balenaEtcher, UNetbootin and YUMI.MultiSystem alternatives are mainly Bootable USB Creators but may also be Linux Distros. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of MultiSystem.