Horos - A free, open source 64-bit DICOM medical image viewer
ChemDraw - ChemDraw - The Gold Standard for Chemical Structure Drawing and Research Publications.
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.
ImageJ - and Other Health Care
AMIDE - AMIDE: a Medical Image Data Analysis Tool
ACD/ChemSketch - ACD/ChemSketch for personal and academic use brings the power of our structure drawing package to your home computer.