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.
GeoGebra CAS Calculator - Free online algebra calculator from GeoGebra: solve equations, expand and factor expressions, find derivatives and integrals
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.
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.
GeoGebra - GeoGebra is free and multi-platform dynamic mathematics software for learning and teaching.