Mechanical Creature Kit
A feature-rich kitbash pack for Blender, made for creating photorealistic mechanical creatures!
Polyfjord activity
Five Customizable Textures for Blender 2.80
A ready-to-render scene with five customizable materials for Blender 2.80
Here is the tutorial on how to set this up yourself: https://youtu.be/O_spJmmST5I