GIMP - GIMP is a multiplatform photo manipulation tool.
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.
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Corel Painter - Corel Painter is media painting software.
Fresh Paint - Microsoft's new painting software with more realistic brushes for Windows 10
Photoscape - high quality photo editing software, that enables you to fix and enhance photos.