Many companies use this software for editing photos.
I use this for our company work and this works perfectly for image editing process.
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.
GIMP - GIMP is a multiplatform photo manipulation tool.
Sketchable - Creators of Sketchable!
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
Corel Painter - Corel Painter is media painting software.
Paint.NET - Paint.NET is a free image and photo editing software.