Many companies use this software for editing photos.
I use this for our company work and this works perfectly for image editing process.
Diagrammix - Tool for efficiently building attractive diagrams.
GIMP - GIMP is a multiplatform photo manipulation tool.
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
ProcessMaker - ProcessMaker is an easy to use BPM and workflow software solution. It is used to design, automate, and deploy business processes of any kind.
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.