Source : Free On-Line Dictionary of Computing

eXperimental LISP
     
         (xlisp) An experimental programming language
        combining a subset of {Common Lisp} with an {object-oriented}
        extension capability (Class and Object types).  It was
        implemented by David Micheal Betz at Apple to allow
        experimentation with {object-oriented programming} on small
        computers.  The {C} {source code} has been ported to {Unix},
        {Microsoft Windows}, {Macintosh}, {Amiga}, {Atari}, and
        {MS-DOS}.
     
        Version 2.1 of the {interpreter}, by Tom Almy is closer to
        Common Lisp.
     
        Latest version: 2.1, as of 1992-05-26.
     
        {(ftp://wasp.eng.ufl.edu/)}, {(ftp://cs.orst.edu/)},
        {(ftp://glia.biostr.washington.edu/)}.
     
        E-mail: Tom Almy .
     
        {Microsoft Windows version
        (ftp://ftp.cica.indiana.edu/util/wxlslib.zip)}.
     
        {Macintosh version (ftp://netcom.com/pub/bskendig/)}.
     
        {Usenet} newsgroup: {news:comp.lang.lisp.x}.
     
        (2000-08-14)