Ralpha Image Resizer - High-speed image batch conversion tool
ImageJ - and Other Health Care
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Avogadro - Avogadro is a free, fantastically easy to use molecule editor.
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.
ACD/ChemSketch - ACD/ChemSketch for personal and academic use brings the power of our structure drawing package to your home computer.