Molden is a package for displaying Molecular Density from the Ab Initio packages GAMESS, GAUSSIAN and the Semi-Empirical packages Mopac/Ampac. It also supports a number of other programs via the Molden Format. For the HPC2015 system, you can load the application by 'module load molden' in the frontend node hpc2015-file.hku.hk. As it is X-window application, user have to run VNC server or run GUI application before launching molden.
To run molden at X-windows:
Official Molden website: http://www.cmbi.ru.nl/molden/