S is a statistical programming language developed primarily by John Chambers and (in earlier versions) Rick Becker and Allan Wilks of Bell Laboratories. The aim of the language, as expressed by John Chambers, is "to turn ideas into software, quickly and faithfully."
The two modern implementations of S are R and S-PLUS. The R implementation is listed in TIOBE index (October 2012) at position 28, S-Plus and generic S are listed among the 100 most popular programming languages.