Horos - A free, open source 64-bit DICOM medical image viewer
Weasis - Weasis is a multipurpose standalone and web-based DICOM viewer.
3DimViewer - 3DimViewer is a 3D viewer software for medical DICOM datasets that is written in C++, effectively runs on MAC OS, and Linux systems.
3D Slicer - Slicer is a community platform created for the purpose of subject specific image analysis and...
RadiAnt DICOM Viewer - PACS-DICOM Viewer. RadiAnt is a PACS-DICOM viewer for medical images designed to provide you with a unique experience.
AMIDE - AMIDE: a Medical Image Data Analysis Tool