ImageJ - and Other Health Care
ChemDraw - ChemDraw - The Gold Standard for Chemical Structure Drawing and Research Publications.
Cortellis - Enter your description
Avogadro - Avogadro is a free, fantastically easy to use molecule editor.
ACD/ChemSketch - ACD/ChemSketch for personal and academic use brings the power of our structure drawing package to your home computer.
LabVantage Pharma - Built Better for Pharmaceutical