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.
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
Autodesk SketchBook - SketchBook drawing and painting software provides designers, architects, and concept artists the tools to sketch ideas quickly and create beautiful illustrations.
Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.
Clip Studio Paint - The artist's software for drawing and painting.
Strikethru - Strikethru is a kind of to-do list notebook for managing work lists and staying updated with the important tasks.