ChemApp light is a free demo version of ChemApp with almost the same functionality as the full version. It comes with full documentation, which is already accessible online and contains complete references to all ChemApp subroutines, with dozens of code examples in both FORTRAN and C, as well as several working examples to give you an idea of how to start coding your own application programs using ChemApp.
If you are interested in trying ChemApp light, please contact our ticketing system for customer support.
Please also have a look at the ChemApp FAQ for answers to many common questions about ChemApp light.