Many companies use this software for editing photos.
I use this for our company work and this works perfectly for image editing process.
Modelio - Modelio is an open source modeling tool supporting natively UML, BPMN and model exchange with XMI.
GIMP - GIMP is a multiplatform photo manipulation tool.
Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
UML Designer - UML Designer provides a set of common diagrams to work with UML 2.5 models.
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.