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.
MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.
Clip Studio Paint - The artist's software for drawing and painting.
PaintTool SAI - Learn to draw in different ways.
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Rebelle - Rebelle is a one-of-a-kind paint software that lets you create realistic watercolor, acrylic, wet and dry media artwork, using real-world color blending, wet diffusion and drying.