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.
Paper by WeTransfer - A collection of creative prompts
Procreate - Procreate is the most powerful and intuitive digital illustration App available for iPad®.
Milanote - Milanote is a note taking app for creative work.
Autodesk SketchBook - SketchBook drawing and painting software provides designers, architects, and concept artists the tools to sketch ideas quickly and create beautiful illustrations.
Astropad - Astropad is a free form drawing tool designed from the ground up to take advantages of the features offered by an iPad.