Kontakt is a software sampler screated by the German company Native Instruments. Kontakt is the industries standard software sampler and is available in two different versions, the free Kontakt Player and the full version, which is appropriately called Kontakt. Both versions can be used either as a standalone application or as a plug-in in the common digital audio workstations (DAW) via various interfaces. Bare in mind that all CL-Projects' Kontakt bundles will only run in the full version of Kontakt. Consult the appropriate libraries pages to see which lowest Kontakt version you need to run the libraries.