Many companies use this software for editing photos.
I use this for our company work and this works perfectly for image editing process.
Pexels - Find the best free stock images about Browser Home Page. Download all photos and use them even for commercial projects.
GIMP - GIMP is a multiplatform photo manipulation tool.
Stock Up - The best free stock photos in one place
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
TheStocks.im - Best royalty free stock photos, videos, mockups, icons and fonts in one place.
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.