Pixelmator - Pixelmator is an image-editing application for Mac and iPad.
Krita - Krita is a professional FREE and open source painting program. It is made by artists that want to seaffordable art tools for everyone. Concept art. texture and matte painters, illustrations and comics.
Canva - Canva is a graphic-design platform with a drag-and-drop interface to create print or visual content while providing templates, images, and fonts. Canva makes graphic design more straightforward and accessible regardless of skill level.
Artrage - A simple but lovely natural media painting and sketching program.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.