Polyraven UV tools is a MEL script for MAYA*, which makes it easier to unwrap hardsurface geometries, and much faster to deal with the distribution and layout of the UV shells. It includes checker materials, and error checking functions, which can relatively quickly find: flipped, overlapping, incorrectly positioned and missing UVs. And many more things. Find out more at: https://www.polyraven.com/uv/
*Tested in MAYA 2017, 2018 and 2019
NOTE: Some functions do not work in MAYA 2017 and earlier.
About the licenses:
Personal License is for for one person, who plans to install it to his personal workstation and laptop for example.
Studio License is meant for studios and companies, where more people is going to use the script either through network or by making a copy on each workstation inside the studio. One license is for one studio.