GitHub - QCPolmer/Blender-3d-remove-duplicate-materials-in-scene: Run this script from a scene and it will replace all materials with a '.001' or whatever with the material without the number after it. Basically, it is for
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Blender 2.8 - How to delete a texture slot in Texture Paint mode? - CG Cookie
Material Panel Overview - materialiq 4.6.2
Ability to remove material slots in edit mode — Right-Click Select
scripting - Delete all materials that aren't assigned to a face? - Blender Stack Exchange
How do I delete Materials? - Basics & Interface - Blender Artists Community