Horos - A free, open source 64-bit DICOM medical image viewer
ImageJ - and Other Health Care
Weasis - Weasis is a multipurpose standalone and web-based DICOM viewer.
Fiji - Fiji: A batteries-included distribution of ImageJ.
3D Slicer - Slicer is a community platform created for the purpose of subject specific image analysis and...
Icy - Icy is an open community platform for bioimage informatics