Many companies use this software for editing photos.
I use this for our company work and this works perfectly for image editing process.
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.
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
Artrage - A simple but lovely natural media painting and sketching program.
MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.
Sketch - Professional digital design for Mac.