Many companies use this software for editing photos.
I use this for our company work and this works perfectly for image editing process.
Carbon - Create and share beautiful images of your source code.
GIMP - GIMP is a multiplatform photo manipulation tool.
RNI Films - Real film filters for iPhone photographers
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
infltr - Discover Infinite Filters for every Picture!
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.