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LAMMPS is a classical molecular dynamics simulator designed for parallel machines. It can model atomic, polymeric, biological, metallic, or mesoscale systems using a variety of force fields and boundary conditions and is easy to modify or extend.
PARAMESH is a package of Fortran 90 subroutines designed to provide an
application developer with an easy route to extend an existing serial
code which uses a logically cartesian structured mesh into a parallel
code with adaptive mesh refinement(AMR).