Lisp

Pascal is for building pyramids -- imposing, breathtaking structures built by armies pushing heavy blocks into place. Lisp is for building organisms.
-- Alan Perlis

Common Lisp is a standard programming language created in 1960 by John McCarthy that has survived and evolved until today.

There are commercial compilers (Allegro, LispWorks, CormanLisp, MCL) and free ones (CMUCL, SBCL, Clisp, ECL, OpenMCL). This site runs CMUCL.

This page is a lisp function. In fact, every page on this server is a lisp function.