Just saw this tool new tool (at least new to me) on gamefromscratch. Nice free material maker made in Godot...looks like it was made by @RodZilla . Looks good! Check it out!
https://www.gamefromscratch.com/post/2020/01/22/Material-Maker-08-Released.aspx
Tagging @Serapth
Get the tool here: