Many companies use this software for editing photos.
I use this for our company work and this works perfectly for image editing process.
UI Garage - Specific mobile and web design patterns for your inspiration
GIMP - GIMP is a multiplatform photo manipulation tool.
Muzli - UI/UX and Design Inspiration Chrome Extension
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
Design Hunt - Curated design inspiration for everyone
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.