For those who need to parametrize new ligands, there is a new alternative VMD pluggin, named Paratool,  to do so. It works for both AMBER and CHARMM, but has been specially designed for the latter one.

     Sometimes, I've faced the problem to determine the number of contacts between protein residues and a given ligand (which may come from x-ray or docking results).
 

  Googling I found this webpage that could be useful for some people who might start using Gaussian (from very basic to more realistic and complicated cases).

    I only expected could be as useful as it were for me.

    The e-link is:

https://www.wiki.ed.ac.uk/display/EaStCHEMresearchwiki/Training

       An excellent webpage with e-links to different programs / packages that have been specially designed for theoretical chemistry (QM, docking, chemoinformatics, crystallography...) classified as open-source, freeware, commercial or free for academics.

      Hihgly recommended if you are looking for a program for doing something but your budget is limited

 

       http://www.redbrick.dcu.ie/~noel/linux4chemistry/

 

 Here, a brief depiction on how to run docking with rbdock program: