NAMD (Not (just) Another Molecular Dynamics program) is a free-of-charge parallel molecular dynamics simulation package written using the Charm++ parallel programming model. Namd is noted for its parallel efficiency and often used to simulate large systems (millions of atoms). It scales to hundreds of processors on high-end parallel platforms and tens of processors on commodity clusters using gigabit ethernet. For Simulation setup, Namd uses the molecular graphics program VMD
Namd has been developed by the joint collaboration of the Theoretical and Computational Biophysics Group (TCB) and the Parallel Programming Laboratory (PPL) at the University of Illinois at Urbana-Champaign. For more information please refer to: original document 1 & original document 2 .