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.
PaintBerri - PaintBerri is a free art site that offers an awesome oekaki community.
Procreate - Procreate is the most powerful and intuitive digital illustration App available for iPad®.
Brush Ninja - Hand-drawn Animated Gif Creator
Autodesk SketchBook - SketchBook drawing and painting software provides designers, architects, and concept artists the tools to sketch ideas quickly and create beautiful illustrations.
okekai - A small community site where you can draw, animate, and chat through pictures all for free