MPI

AutoMap and AutoLink - Tools for using user-defined data types with MPI. Papers, source code, and documentation.
math.nist.gov/mcsd/savg/auto/

HP MPI - Implementation of MPI for Hewlett Packard systems. Product information, free evaluation copy, and purchasing information.
h21007.www2.hp.com/dspp/tech/tech_TechDocumentDetailPage_IDX/1,1701,1238,00.html

LAM / MPI Parallel Computing - Local Area Multicomputer is an MPI implementation. Source code, papers, documentation, and mailing list archives.
www.lam-mpi.org/

MacMPI - Implementation of MPI for Mac OS 9.
exodus.physics.ucla.edu/appleseed/dev/Developer.html

Message Passing Interface - Interface standard, tutorials, libraries, and links to other resources, as well as MPICH, an implementation of MPI.
www-unix.mcs.anl.gov/mpi/

MPI-FM - High-performance cluster implementation of MPI for Windows. Source code, documentation, and papers.
www-csag.ucsd.edu/projects/comm/mpi-fm.html

MP-MPICH - Multi-Platform MPICH - An implementation of MPI for Windows (NT/2000/XP/2003), Solaris and Linux. Supports Scalable Coherent Interface (SCI), TCP/IP and shared memory for communication. Runs on IA-32, Alpha and Sparc architectures. Source, binaries, and documentation available.
www.lfbs.rwth-aachen.de/content/mp-mpich

Paradyn - Measurement and analysis tool for parallel programs that use MPI. Papers, source code, binaries, and manuals.
pages.cs.wisc.edu/~paradyn/

Scali - ScaMPI is an implementation of MPI using the Scalable Coherent Interface. Product information and download.
www.scali.com/

SKaMPI -Special Karlsruher MPI Benchmark - Open-source MPI Benchmark with public result database.
liinwww.ira.uka.de/~skampi

StarMPI - System to allow binding of MPI to a generic interactive language. Source code and documentation.
http://tylerschnaidt.com/blocked/nph-index.pl/010110A/ftp/ftp.ccs.neu.edu/pub/people/gene/starmpi/