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.
Photoscape - high quality photo editing software, that enables you to fix and enhance photos.
MediBang Paint - The official site for MediBang Paint, the free digital painting and manga creation software. You can download the latest version of MediBang Paint here, and get news and tutorials.
Pixelmator - Pixelmator is an image-editing application for Mac and iPad.
Corel Painter - Corel Painter is media painting software.
Pixlr - Pixlr® makes it easy to transform everyday images into stunning works of art.