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.
Stickman: Draw animation - Stickman: Draw animation is an animation editing tool that allows you to create your own animated movies in a few minutes.
Artrage - A simple but lovely natural media painting and sketching program.
Looom - Looom is one of the best hand-drawn animation apps that makes it easy for anyone to create beautiful animations.
Procreate - Procreate is the most powerful and intuitive digital illustration App available for iPad®.
Pigment by ShapeFactory - A unique way to explore color using lighting and pigment