ChemDraw - ChemDraw - The Gold Standard for Chemical Structure Drawing and Research Publications.
Avogadro - Avogadro is a free, fantastically easy to use molecule editor.
Cortellis - Enter your description
ImageJ - and Other Health Care
ACD/ChemSketch - ACD/ChemSketch for personal and academic use brings the power of our structure drawing package to your home computer.
TrueChem - TrueChem is software designed specifically to control and automate the management of chemistries, coatings, and wet processes.