The best open source alternative to Adobe Substance 3D Painter is Material Maker. If that doesn't suit you, our users have ranked more than 10 alternatives to Adobe Substance 3D Painter and four of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Adobe Substance 3D Painter are ArmorPaint, Nirvana 3D and MeshCoat.
Material Maker is a free and open-source, procedural texture authoring tool based on Godot Engine. Its user interface is based on Godot's GraphEditor: textures are described as interconnected texture generators and operators.
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Armor paint is a standalone software for 3d texture painting in PBR. It is entirely GPU based, and supports windows and linux.
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A game engine written in Python, extending support across multiple GPU devices with 3D rendering, PBR Renderer and much more.
A dedicated 3D texture painting application for painting full PBR material channels directly onto 3D geometry with layers, procedural wear, and multi-mesh support.
