Concurrent programming is a computer programming technique that provides for the execution of operations concurrently?—?either within a single computer, or across a number of systems. In the latter case, the term distributed computing is used. (Wikipedia)
It is actually a family of Actor-Based Concurrent Languages, which was developed in Japan during the 1980s and the 1990s. ABCL/1, ABCL/R, and ABCL/R2 are some members of the ABCL family.

It is a multi-threaded functional programming language. Its interpreter is written in C++. Its runtime engine supports both 32 and 64 bit platforms.

Created at the MIT Laboratory in 1994, Cilk supports multithreaded parallel programming.

Concurrent Pascal
Per Brinch Hansen, a Danish-American computer scientist created Concurrent Pascal for writing operating systems and programming real-time systems.

It is an object-oriented programming language that supports distributed programming. Mark Miller, Dan Bornstein and associates at the Electric Communities developed E in 1997. Its syntax resembles that of Java.

List of Compiled Programming Languages

Joule is a concurrent dataflow programming language that preceded the E programming language. It is used for distributed applications.

Developed at the Bell Labs, Limbo is used for programming distributed systems. Its striking feature is its compiler’s ability to generate architecture-independent object code. Limbo is used for applications running on Inferno operating system. Alex that was initially a part of the Plan 9 operating system is the predecessor of Limbo.

It is a statically typed programming language, which is in the experimental stage today.

Short for Simple Actor Language System and Architecture, SALSA supports concurrent programming, message passing, and distributed computing. It uses Java code for portability.

Acronym of Synchronizing Resources, SR is a concurrent programming language.

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