Many companies use this software for editing photos.
I use this for our company work and this works perfectly for image editing process.
Stark - Contrast check and color blindness simulator for Sketch.
GIMP - GIMP is a multiplatform photo manipulation tool.
President Flip Flops - Going back on your word, one step at a time
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
Catch - Catch is the easiest way to use ShowRSS on OS X. It'll take care of everything.
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.