Knoppix is described as 'Operating system based on Debian designed to be run directly from a CD / DVD (Live CD) or a USB key (Live USB), one of the first of its kind for any operating system. When starting a program, it is loaded from the removable medium and decompressed into a RAM drive' and is a Linux Distro in the os & utilities category. There are more than 50 alternatives to Knoppix for a variety of platforms, including Linux, Windows, Self-Hosted, BSD and Raspberry Pi apps. The best Knoppix alternative is Debian, which is both free and Open Source. Other great apps like Knoppix are Fedora, Arch Linux, Tails and Zorin OS.