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

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
- http://www.lfbs.rwth-aachen.de/mp-mpich

Los Alamos Message Passsing Interface (LA-MPI)
- An open-source software implementation provides an end-to-end network fault-tolerant message passing system for tera-scale clusters. The current API supported being MPI 1.2 (C and Fortran bindings).
- http://www.ccs.lanl.gov/ccs1/projects/la-mpi/

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

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

HPC - High Performance Computing
- Home of WMPI II that provides MPI-2 implementation that are fully optimised, thread-safe and commercially supported for Windows and Linux platforms. Implementation of MPI for Windows. Product information, downloads, and papers.
- http://www.criticalsoftware.com/hpc/

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

StarMPI
- System to allow binding of MPI to a generic interactive language. Source code and documentation.
- ftp://ftp.ccs.neu.edu/pub/people/gene/starmpi/

MPI Software Technology
- A commercial implementation of MPI and parallel job scheduler. Product information and white papers.
- http://www.mpi-softtech.com/

MPI
- Papers about an implementation of MPI on the Fujitsu AP1000.
- http://cap.anu.edu.au/cap/projects/mpi/mpi.html

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

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

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

MPI-BIP
- A port of MPICH over Myrinet using the BIP communication layer. Source code and benchmarks.
- http://lhpca.univ-lyon1.fr/mpibip.html

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

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