Ess Language

S language (EssLanguage) is a programming language designed for use for calculation of statistics.

http://cm.bell-labs.com/cm/ms/departments/sia/Sbook/index.html

For the background see this article on Wikipedia: http://en.wikipedia.org/wiki/S_%28programming_language%29

R language (ArrLanguage) is a public domain version.

CategoryProgrammingLanguage CategoryStatistics