KNOPPIX is a bootable Live system on CD, DVD or USB flash drives, consisting of a representative collection of GNU/Linux software. Developed by Klaus Knopper
License: Free
Knoppix is primarily a live distribution focused on providing a robust environment for immediate use without installation, making it great for recovery and troubleshooting. In contrast, Kubuntu is a full-fledged Linux distribution based on Ubuntu, designed for daily use with a stable environment and extensive software options.