Pixlr - Pixlr® makes it easy to transform everyday images into stunning works of art.
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.
Adobe Photoshop Express - Easily edit and share your photos in no time!
Corel Painter - Corel Painter is media painting software.