easyPipeline3d is a data management suite that will help your 3D production to run faster and smoother, letting you focus on the artistic aspect of your project. It will take care of most of the technical work automating naming conventions, data structures, shading, cache workflow and more.
Maya Scene Converter is a python-based Qt tool for converting scenes from a render engine to another in Maya, it is not a perfect conversion and it depends on rules files and how good they are but gives you a great head start.
Automatic preset shading network setup with options for searching for files according to predefined naming conventions. Comes with presets for Redshift, Arnold, and the standard lambert shader, but documentation is included on how to define your own presets for your preferred rendering engine!