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.
Horos - A free, open source 64-bit DICOM medical image viewer
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
MicroDicom - DICOM viewer. MicroDicom is a free DICOM viewer. Export to the most common picture formats, movie, clipboard. It is equipped with most common tools for manipulation of DICOM images.
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.
Weasis - Weasis is a multipurpose standalone and web-based DICOM viewer.