Material Maker: https://rodzill4.github.io/material-maker/doc/index.html

animation tools:

https://tahoma2d.org/download/

https://morevnaproject.org/opentoonz/ https://opentoonz.github.io/e/index.html

http://www.toonz.com/ Commerciale ma Italiano

Shaders: https://godotshaders.com/