Horos - A free, open source 64-bit DICOM medical image viewer
A360 VIEWER - Free online CAD Viewer
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.
STP Viewer - Free STP Viewer - free software that lets you view 3D STEP files (.stp, .step file format).
AMIDE - AMIDE: a Medical Image Data Analysis Tool
Glovius - Extensible & customizable 3D viewer, for consumption of product design data.