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.
Percolator - Percolator: the always fun, supremely unique photo app that is sure to surprise you! FEATURES:
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
AndreaMosaic - With AndreaMosaic you can create your own photographic mosaics made with your own pictures.
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.
Mosaic Creator - Mosaic Creator is professional mosaic tool. You can create your own picture mosaic.