Sketch Mirror - Preview your iOS designs directly on your devices
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.
Flowkit - Sketch library for user flows/content maps/annotations
Procreate - Procreate is the most powerful and intuitive digital illustration App available for iPad®.
Figma Mirror - Figma Mirror is an application that covers top trending designing or sketching ideas making your teamwork in a single environment and design better products from start to finish.
Autodesk SketchBook - SketchBook drawing and painting software provides designers, architects, and concept artists the tools to sketch ideas quickly and create beautiful illustrations.