Many companies use this software for editing photos.
I use this for our company work and this works perfectly for image editing process.
MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.
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.
Paint.NET - Paint.NET is a free image and photo editing software.
PaintTool SAI - Learn to draw in different ways.