Emacs Speaks Statistics (ESS) provides an intelligent, consistent
interface between the user and the software.  ESS interfaces with
S-PLUS, R, SAS, BUGS and other statistical analysis packages under the
Unix, Microsoft Windows, and Apple Mac OS operating systems.  ESS is a
package for the GNU Emacs and XEmacs text editors whose features ESS
uses to streamline the creation and use of statistical software.  ESS
knows the syntax and grammar of statistical analysis packages and
provides consistent display and editing features based on that
knowledge.  ESS assists in interactive and batch execution of
statements written in these statistical analysis languages.