Languages

Parlog - A concurrent version of Prolog which provides both AND and OR parallelism. Documentation and download for Windows (free for non commercial use) available.
http://www.parlog.com/

Unified Parallel C at George Washington University - Community site: projects, news, FAQ, documents, publications, tutorials, forum, mail list, work groups, events, downloads.
http://upc.gwu.edu/

The Cilk Project - A language for multithreaded parallel programming based on ANSI C. Source code, manual, papers, and research into parallel chess programs.
http://supertech.csail.mit.edu/cilk/

ZPL - An array programming language. Sample code, papers, recipes, reference manual, and source code.
http://www.cs.washington.edu/research/zpl/index.html

PARLANSE - A parallel programming language supporting symbolic computation on SMP workstations.
http://www.semdesigns.com/Products/Parlanse/index.html

Jade - Jade is a parallel extension to C that allows transparent access to shared memory. Papers, manual, and source code.
http://suif.stanford.edu/~scales/sam.html

Parallaxis-III - Structured language for data-parallel programming (SIMD systems), based on sequential Modula-2, extended. Source code, binaries, sample code, documents.
http://robotics.ee.uwa.edu.au/parallaxis/

PARSEC - PARallel Simulation Environment for Complex systems. C-based simulation language for sequential and parallel execution of discrete-event simulation models. Online technical support, manuals, source code. Replaced Maisie language.
http://pcl.cs.ucla.edu/projects/parsec/

The SR Programming Language - Synchronizing Resources is a language for writing concurrent programs. Source code, mailing list archive, and documentation.
http://www.cs.arizona.edu/sr/

Orca - Language for parallel programming on distributed systems, based on the shared data-object model, a portable form of object-based distributed shared memory. Papers and manual.
http://www.cs.vu.nl/orca/

BERT 77 - Parallelizing compiler for Fortran 77. Software download, reference manual, mailing list. Free.
http://www.basement-supercomputing.com/content/view/24/50/

Z++ - An extension of C++ to platform-free distributed computing. It enhances C++ with invariants, threading, database, GUI and conponent-oriented design. Z++ virtual processor supports the entire language on many platforms.
http://www.zhmicro.com

NESL - A functional parallel language. Tutorial, source code, algorithm library, animations, and reference manual.
http://www.cs.cmu.edu/~scandal/nesl.html

Unified Parallel C: UPC - Extensions to C to support distinctions between local and shared data structures, and pointers to them; for high performance computing on large-scale parallel machines, uniform programming model for shared and distributed memory.
http://upc.lbl.gov/

Acute - Experimental high-level language for distributed computing, focus: typing, naming, version change; designed, formally specified, implemented; extends OCaml core to support distributed development, deployment, execution, type-safe interaction between separately-built programs.
http://www.cl.cam.ac.uk/~pes20/acute/

JavaParty - A minimal extension to Java easing distributed parallel programming of cluster computers. A source code transformation automatically generates a distributed pure Java program based on RMI or KaRMI.
http://www.ipd.uka.de/JavaParty/

Mentat - Object-oriented parallel language based on C++. Documentation, source code and binaries, and sample programs.
http://www.cs.virginia.edu/~mentat/index.html

Charm++ - An object-oriented portable parallel language built on top of C++. Source code, binaries, manuals, and publications.
http://charm.cs.uiuc.edu/

mpC - Parallel extension to C designed for applications development for heterogeous networks. Source code and documentation.
http://www.ispras.ru/~mpc/

Mesham - By using type based parallelism the programmer can write very efficient, simple, code targeted at Grids, Clusters or SMPs in this language. Full online documentation and source/binaries available for download.
http://www.mesham.net

Maisie - C-based simulation language that can be used for sequential and parallel execution of discrete-event simulation models. Papers, source code, sample models. Replaced by PARSEC language.
http://may.cs.ucla.edu/projects/maisie/