Erlang

Erlang is a language developed at Ericsson.
It actually include a concept of virtual machine just like Java, to support populating process.
This language takes massive parallelism and failure in mind from the beginning.
As a result, it is a good fit to large scale distributed system.
It is proven useful, as some of ericsson product and other open-source projects were written in Erlang and work well.

However, people complain about its syntax - As a functional language, the syntax of Erlang is not that easy compared to traditional imperative languages. To be a functional language seems inevitable to prevent side-effect which is bad for concurrent program, but it still keep ordinary programmers from using it.