Heeeey I took the liberty to submit Material Maker to Itch as a tool to add in the metadata of games. We have used it in our pre-alpha version of Qhipan (https://messy-bytes.itch.io/qhipan)
It would be awesome if you also submit it (goint into analytics, metadata of a project you'll see the tool options and can suggest with the link bellow the field)
Material Maker is awesome, it was my introduction into authoring materials and I will keep using it as long as I have brain.
(And as soon as I get a job again donate!!)
Thanks for your work.