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mpich (version 1.2.5)
MPICH is a freely available, portable implementation of MPI, the new standard for message-passing libraries.
MPICH is a joint-effort project between Argonne National Laboratory (Bill Gropp and Rusty Lusk) and Mississippi State University (Tony Skjellum and Nathan Doss). Hubertus Franke of IBM has also made major contributions, as have Ed Karrels and Patrick Bridges (student interns at ANL). The difficult job of getting the spec right was done by the MPI Forum as a whole.