Great option to other image editors and image creating software. It has a simple and intuitive user interface, yet supports both layers and 3D objects. Functional across all major OS. It is free, as in open source. It imports .PDN files created with Paint.NET without issues.
Sketch - Professional digital design for Mac.
MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
GIMP - GIMP is a multiplatform photo manipulation tool.
Affinity Designer - Professional creative software, exclusively for Mac.
Microsoft Paint - Paint (formerly Paintbrush) is a simple, ultra-basic graphics painting program that is included...