Materia is a node-based material editor that allows users to create and map materials using a GUI. The Authors describe the software as “An open source alternative to Substance Designer written in C#”. Materia is still in early Alpha development, but it has already gained a following among GitHub users. The project is hosted on GitHub and is actively being developed by a community of contributors. It is licensed under the MIT License, which means that it can be used for personal and commercial projects. Materia looks set to be a promising open-source alternative to other 3D Design Software.
You can download the Alpha Release on github.
Images: MIT Licensed.