ACD/ChemSketch - ACD/ChemSketch for personal and academic use brings the power of our structure drawing package to your home computer.
ChemDraw - ChemDraw - The Gold Standard for Chemical Structure Drawing and Research Publications.
ImageJ - and Other Health Care
Gnome Chemistry Utils - The Gnome Chemistry Utils include six chemistry related programs:
Avogadro - Avogadro is a free, fantastically easy to use molecule editor.
MolView - Open Source online service