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/]]