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.
Ralpha Image Resizer - High-speed image batch conversion tool
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
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.
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.