Jaguar - Java Access to Generic Underlying Architectural Resources
Jaguar is an extension of the Java runtime environment which enables direct Java access to operating system and hardware resources, such as fast network interfaces, memory-mapped and programmed I/O, and specialized machine instruction sets.

NetSolve
A client-server system that enables users to solve complex scientific problems remotely using a variety of languages. Documentation and software available.

OpenMP
An API for multi-platform shared-memory parallel programming in C/C++ and Fortran. Specification, presentations, event calendar, and sample programs.

Piranha
Papers about adaptive parallelism.

SGI: Message-Passing Toolkit
Implementations of MPI and PVM for IRIX. Documentation and download.