This application lets STM or AFM images AND molecular models to be overlaid. It is useful to understand how your molecules fit to what you observed and can help interpret your data. What makes this application more useful than paint programs (powerpoint or inkscape) is the fact that the size of the images and of the molecule is fixed, so that you know that you are working in real space.
Check https://sourceforge.net/p/spm-and-mol-viewer/wiki/Home/ for updates.
We've moved to https://github.com/tjod/gMol/wiki
gMol is an interactive visualization system used to display and manipulate 3-dimensional models of scientific data, such as molecular structures and surfaces. It contains both OpenGL and web browser widgets that enable flexible user interfaces.