This plugin relaxes(reduces) UV mapping distortion.
Mapping distortion is the difference of shape and area between 2D(on UV plane) mesh and original 3D mesh.
The following figure shows an example of processing an UV mapped hemisphere.

Before Relaxation:
There is a difference between texel density on the top of the shape and that on the boundary.


After Relaxation:
Area(texel density) distortion was reduced.