This is a modeling tool for Blender 2.79 and 2.80 that lets you use curves to deform your mesh, allowing you to make beautiful shapes.
It's useful for blocking and polishing forms of organic and hard surface meshes.
The easiest way to use it is to just select some vertices and call the tool, like this:
There's lots more to it, see the documentation tab!
Current version: 0.9.3