3D Slicer - Slicer is a community platform created for the purpose of subject specific image analysis and...
digiKam - Professional Photo Management with the Power of Open Source
ImageJ - and Other Health Care
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.
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.
ACDSee Photo Studio - ACDSee becomes ACDSee Photo Studio โ ACDSee Photo Studio Standard 2018 continues the ACDSee legacy