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.
Rentman - Cloud rental management software for the AV & Event industry
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
projectM - projectM is an LGPL'ed reimplementation of Milkdrop under OpenGL.
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.
Current RMS - RMS for AV, production, broadcast & event rental companies