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.
Open Peeps - A hand-drawn illustration library.
Autodesk SketchBook - SketchBook drawing and painting software provides designers, architects, and concept artists the tools to sketch ideas quickly and create beautiful illustrations.
skribbl - Word guessing based on drawing.
Clip Studio Paint - The artist's software for drawing and painting.
Fontself Maker for Photoshop - Turn any lettering into color & vector fonts