These are official or authorized third-party libraries. In Kontakt 8, you usually add these via the Native Access utility or by using the 'Manage Libraries' option directly in the Kontakt browser.
Even in modified versions, the core functionality of Kontakt 8 remains, offering: New Sound Design Tools : Includes , a tool for experimental sound manipulation, and Leap Expansions for loops and rhythms. Performance Improvements
: A new high-DPI framework and "Komplete Script" language that allows developers to create beautiful, modern, and scalable interfaces.