ImageJ - and Other Health Care
Fiji - Fiji: A batteries-included distribution of ImageJ.
Avogadro - Avogadro is a free, fantastically easy to use molecule editor.
Icy - Icy is an open community platform for bioimage informatics
ACD/ChemSketch - ACD/ChemSketch for personal and academic use brings the power of our structure drawing package to your home computer.
Image Pro - Used by researchers worldwide, Image-Pro Plus image processing software makes it easy to acquire images, count, measure and classify objects, and automate work.