This is a Blender addon used to easily create ui panels in the 3d viewport.
The features are meant to help blender asset creators and asset users leverage the power of custom properties and operators during their workflow without having to write any python themselves (except to write any new operator of course).
The releases are available in github’s release tab. Unless you know what you are doing, you shouldn’t have to unzip the archive.
Installation instructions can be found in the Blender manual.
See the addon’s usage and information on its site.