Horos - A free, open source 64-bit DICOM medical image viewer
Stet.io - Stet.io is a high-quality pixel management platform that allows editing the pictures with online commands or multiple options with real-time effects or filters.
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.
AliveColors - AliveColors is comprehensive graphics and photo editing software for Windows and Mac.
Materialise Mimics - Materialise Mimics is software specially developed by Materialise for medical image processing.
ImageForge - - ImageForge Standard Freeware Edition: