Many companies use this software for editing photos.
I use this for our company work and this works perfectly for image editing process.
FotoJet - Free Online Graphic Designer | Collage Maker | Photo Editor
GIMP - GIMP is a multiplatform photo manipulation tool.
Posterist - Create beautiful photo collages in minutes on your Mac
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
QwikBanners - Get your display network campaign going in few clicks, generate all sizes in few seconds, no coding or design skills required
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.