Many companies use this software for editing photos.
I use this for our company work and this works perfectly for image editing process.
MacinCloud - MacinCloud is a Mac cloud platform that provides on-demand Mac cloud servers, flexible dev workload infrastructure and comprehensive Mac in the Cloud solutions
GIMP - GIMP is a multiplatform photo manipulation tool.
XCodeClub.com - Rent your own private Virtual Mac with latest XCode.
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
VirtualMacOSX.com - vmOSX -- is your affordable, Mac-based home on the web.
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.