Open MPI: Open Source High Performance Computing
The Open MPI Project is an open source Message Passing Interface
implementation that is developed and maintained by a consortium of
academic, research, and industry partners. Open MPI is therefore able
to combine the expertise, technologies, and resources from all across
the High Performance Computing community in order to build the best
MPI library available. Open MPI offers advantages for system and
software vendors, application developers and computer science
researchers.
https://www.open-mpi.org/