Wig is a special renderer that simulates and renders hair in a non-realistic fashion.
Note that this is never useful for realistic hair simulation. They're completely different things, and this one is not intended to be realistic. It's recommended to check HairWorks or similar technologies for realistic simulation.
Unity 5.5 or later
Download one of the unitypackage files from the Releases page and import it to a project.
How To Apply This To My Own Model?
Select a mesh inside an imported fbx/obj file and right click it. From the context menu, select "Kvant" -> "Wig" -> "Convert to template". This generates Wig Template file from the mesh. Give it to a WigController component. Then play it.
The vertex count of the source model should be kept low because of 64k vertices limitation in Unity. 500-1,000 would be okay.