OpticSim automatically downloads publicly available glass catalogs when you first build the package. The current list is Nikon, Schott, Sumita, Ohara, and Hoya.
If you have glass files stored locally on your machine you can add the glass files to a sources file and the next time OpticSim is built it will include your glass files as well.
OpticSim can model all forms of geometric aberration including chromatic aberration. We are considering adding some ability to handle diffraction but it is not the highest priority now.
We use OpticSim in my group to simulate complex optical systems that we are designing. We're the only group I know of at Microsoft Research Redmond doing optical research.
If you have glass files stored locally on your machine you can add the glass files to a sources file and the next time OpticSim is built it will include your glass files as well.