ImageJ - and Other Health Care
ChemDraw - ChemDraw - The Gold Standard for Chemical Structure Drawing and Research Publications.
MediaLab Document Control - Other Laboratory
Avogadro - Avogadro is a free, fantastically easy to use molecule editor.
OpenCFU - A powerful, user-friendly and free software to count and characterise bacterial (and other cell) colonies forming units from pictures.
Gnome Chemistry Utils - The Gnome Chemistry Utils include six chemistry related programs: