LAMMPS is a FORTRAN77 version of a classical molecular dynamics simulation code.
The FORTRAN77 version is known as "LAMPS 99". It has been superseded by a more recent C++ version.
LAMMPS was developed at Sandia National Laboratories. The primary author is Steve Plimpton.
CRYSTAL_COORDINATES is an executable FORTRAN90 program which computes the coordinates of points in a face-centered cubic packing, with slight random perturbations, suitable for initializing a molecular dynamics simulation.
MD1 is a FORTRAN90 molecular dynamics simulation program.
MD2 is a FORTRAN90 molecular dynamics simulation program.
MD3 is a FORTRAN90 molecular dynamics simulation program.
MD3GLUE is a FORTRAN90 molecular dynamics simulation program.
MDBNCH is a FORTRAN77 molecular dynamics benchmark program.
MDDISK is a FORTRAN90 program which simulates a soft disk fluid.
MPI is an library of message passing routines that enables parallel processing on a variety of machine architectures, and with a varying number of processors.
MPI_STUBS is a FORTRAN77 library of "stub" MPI routines, which allows a user to compile, load, and possibly run an MPI program on a serial machine.
You can go up one level to the FORTRAN77 source codes.