LAM/MPI Parallel Computing

LAM/MPI is a high-quality open-source implementation of the Message Passing Interface specification, including all of MPI-1.2 and much of MPI-2. Intended for production as well as research use, LAM/MPI includes a rich set of features for system administrators, parallel programmers, application users, and parallel computing researchers.
Find LAM/MPI Parallel Computing at: http://www.lam-mpi.org/