The best Image Editor alternative to Adobe Substance 3D Painter is Paint 3D, which is free. If that doesn't work for you, our users have ranked more than 10 alternatives to Adobe Substance 3D Painter, but unfortunately only two of them are Image Editors.
Paint 3D is Microsoft's totally rebuilt and enhanced version of Microsoft Paint built for Windows 10 and with extensive 3D support as well as other helpful, long-needed additions like pen support and easier cropping feature.
PixaFlux is a node based image processing application. PixaFlux creates and edits images in a non destructive way, using a node graph to organize the workflow without restrictions of size, position or color mode.
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MS 3d Paint does not have the same feature set as Adobe Substance 3D Painter