Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
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.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Autodesk SketchBook - SketchBook drawing and painting software provides designers, architects, and concept artists the tools to sketch ideas quickly and create beautiful illustrations.
Zenkit - Zenkit is the home you always wanted for your ideas, your projects, your business.
Clip Studio Paint - The artist's software for drawing and painting.