CLISP is a Common Lisp implementation by Bruno Haible and Michael Stoll.
It mostly supports the Lisp described by "Common LISP: The Language
(2nd edition)" and the ANSI Common Lisp standard.  CLISP includes an
interpreter, a byte-compiler, a large subset of CLOS and a foreign language
interface.  The user interface language (English, German, French, Spanish)
can be chosen at run time.  An X11 API is available through CLX and Garnet.
CLISP needs only 2 MB of memory and runs on all kinds of systems (Unix,
MS-DOS, OS/2, Windows NT, Windows 95, Amiga 500--4000, Acorn RISC PC).

CLISP is available from ftp://ftp2.cons.org/pub/lisp/clisp/ .
Its home page is http://clisp.cons.org/~haible/clisp.html .