Download of CGSim 9.0 was on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. Commonly, this program's installer has the following filenames: CGSim.exe and CGSim_View.exe etc. We recommend checking the downloaded files with any free antivirus. The program lies within Education Tools, more precisely Science Tools. The most popular version among CGSim users is 9.0. The actual developer of the software is STR Group, Ltd.
From the developer:
The CGSim (Crystal Growth Simulator) code is specialized software for simulation of Czochralski (Cz), Liquid Encapsulated Czochralski (LEC), Vapor Pressure Controlled Czochralski (VCz), and Bridgman growth. The code provides information to growers on the most important physical processes responsible for crystal growth and quality. The CGSim package contains several modules such as Basic CGSim, Defects, Flow Module, and CGSim View.
You may want to check out more software, such as CAEFEM, Photometric Toolbox32 or GenealogicaGrafica, which might be similar to CGSim.