Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Artweaver - Artweaver is a simple Freeware program for creative painting, i.e.
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.
Sketchable - Creators of Sketchable!
Paint.NET - Paint.NET is a free image and photo editing software.
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.