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.
Horos - A free, open source 64-bit DICOM medical image viewer
Weasis - Weasis is a multipurpose standalone and web-based DICOM viewer.
RadiAnt DICOM Viewer - PACS-DICOM Viewer. RadiAnt is a PACS-DICOM viewer for medical images designed to provide you with a unique experience.
xMedCon - an open source toolkit for medical image conversion
AMIDE - AMIDE: a Medical Image Data Analysis Tool