The SFZ Format
The SFZ format is an open source, non-proprietary file format used to create virtual instrument sample libraries, similar to Native Instrument's NKI format for Kontakt. In order to open and use an SFZ file, an SFZ compatible player is required. A number of these exist, but the most popular option is Plogue's sforzando, which is free to download for both Mac and Windows and acts as either a standalone application or a VST/AU/RTAS/AAX plugin. When combined with sforzando, the SFZ format offers many of the same features as Kontakt instruments, including multiple velocity layers, key switches, and round robin. With some clever scripting, you can also include multiple microphone positions and unique effects.
Please note that my SFZ sample libraries are built around and tested in sforzando, so they might not work as intended when loaded into any other application, although any that are labeled as being SFZ level 2.0 or 1.0 (not 2.0+) should work in other SFZ compatible players.
If you have any questions or run into any issues, while using my sample libraries, feel free to Contact Me!