ImageJ - and Other Health Care
Virtualmin - It includes numerous features not in the GPL version (like script installers, resellers, HTML editor, an improved UI, mobile access, spam and virus filtering).
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.
Jmol - Jmol is a free, open source molecule viewer for students, educators, and researchers in chemistry...
TrueChem - TrueChem is software designed specifically to control and automate the management of chemistries, coatings, and wet processes.