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.
Tragofone - White-label VoIP Softphone with WebRTC and Auto-provisioning
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
PhonerLite - PhonerLite enables your PC to use it for internet telephony (VoIP , Voice over IP, SIP).
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.
tSIP - tomeko.net/software: SIP client for Windows.