Kontakt allows you to add third-party powered by Kontakt Libraries to the Browser. These libraries can also be used with the free Kontakt Player.
Please go to the link below for instruction on how to add Kontakt Libraries in Native Access.
https://support.native-instruments.com/hc/en-us/articles/115000685889-Setting-Up-a-Third-Party-KONTAKT-Library
Below is a list of Zero-G Kontakt Libraries that need to be installed using Native Access.
Phaedra (powered by Kontakt Player 2 interface)
EPICA (Virtual instrument powered by Kontakt interface)
EPICA BASS (Virtual instrument powered by Kontakt interface)