Gaussian can be run in both serial and parallel mode. It does not make sense to allocate more than one nighthawk node. Gaussian is a connected system of programs for performing a variety of semi-empirical and ab initio molecular orbital calculations. Present revisions of Gaussian is 94.C3 and 94.E2. Gaussian can be run in both serial and parallel mode.
Some previous versions are also available in parallel versions.
It also gives you access to local fast disks for scratch files. It can be run both in serial and parallel mode. In addition, NWChem has the capability to perform classical molecular dynamics and free energy simulations. Currently you can only run NWChem on clusters of nodes of the same type. The code is a general purpose finite element analysis program with special emphasis on advanced linear and nonlinear structural engineering and heat transfer applications.