Check out the latest version of a shader library for Maya.
ShadeIt allows users to quickly add materials to assets. It features a library of shaders that don't even require UVs allowing you to get nice-looking results in a couple of clicks. The latest version adds new shaders, improves UI, and more.
ShadeIt can be used with Maya 2018 or higher on Windows, macOS, and Linux. You will get the following goodies:
Learn more and get the script for $50+ here.