newLISP® for Mac OS X, GNU Linux, Unix and Win32
From the website:
newLISP is a Lisp-like, general-purpose scripting language. It is especially well-suited for applications in AI, web search, natural language processing, and machine learning. Because of its small resource requirements, newLISP is also excellent for embedded systems applications. Most of the functions you will ever need are already built in. This includes networking functions, support for distributed and parallel processing, and Bayesian statistics.
At version 10.3.3, newLISP say that it has over 350 functions and is about 200K in size.
Interesting that one of the demo applications written in 2007 is MapReduce.
Some posts on its mailing lists but I would not call them high traffic. 😉