Like stated by the readme (which I hope you read), I originally made this mod for Kazashi, but figured that others might find it useful as well, so I decided to release it publicly.
In this mod you can spawn and view models, animate them, attach them to tags, make them spin, position them for cool scenes, all kinds of things you'd expect from a modelviewer. You can also spawn and control lights in the scene, attach them to model tags and such.
Currently only works in DarkPlaces.
Get the mod from my masterfully designed !