ChucK - - Concurrent, time-based, on-the-fly, audio programming language, supports precise, fundamental level of expressiveness, multiple, simultaneous, dynamic control rates, ability to add, remove, modify code as programs run.
Cilk Project - - Concurrent language for parallel programming based on ANSI C. Source code, manual, papers and research into parallel chess programs.
Comega: Cω - - C# extension, in two areas: Control flow extension for asynchronous wide area concurrency (was Polyphonic C#); Data type extension for XML and table manipulation (was Xen and X#).
Communicating Sequential Processes - - CSP is a language for describing patterns of interaction. A book by Tony Hoare introducing the language and the mathematical theory behind it is available in PDF format.
Esterel - - One of a family of synchronous languages which are particularly well-suited to programming reactive systems, including real-time systems and control automata.
FT Languages Page - - Fault-tolerant projects, goal: enhance language support for distributed programs with FT needs, most high-level languages lack good support for such, more so at system level; 3 projects described, FT-SR, FT-Linda, FTAG.
Joule - - The Joule system is a foundation for building distributed applications. Joule Quick Reference 1.0 and The Joule Manual, divided into chapters as PDF files.
Linda - - Simple library implementation of the Linda parallel programming system. SourceForge project page: downloads, forum and CVS.
LoI (Language of Interaction) - - Designed to support interaction-oriented programming. This paradigm is especially suitable for the design of reactive component-based systems like distributed and interactive systems.
MC# - - MC# (Multiprocessor C#) is a high-level object-oriented language based on .NET platform made for developing complex industrial program systems that can use multiprocessors.
MC# 2.0 - - C# extension with async- and movable methods, channels and handlers for concurrent programming on the all types of parallel architectures: multi-core processors, clusters and Grid. Manual, papers, examples, distribution downloads for Windows and Linux.
NesC - - A language for Deeply Networked Systems, implemented as a C extension based on structuring concepts and execution model of TinyOS, an event-driven OS for sensor network nodes with very limited resources: 8K bytes program memory, 512 bytes RAM.
Petri Nets World - - Petri Nets is a formal and graphical appealing language which is appropriate for modelling systems with concurrency.