PCL is available via anonymous FTP from ma2s2.mathematik.uni-karlsruhe.de
[129.13.115.2], directory /pub/lisp/clisp/.

It is also available directly from the GNU Project on the `Emacs'
distribution tape.  For more information, please ask gnu@prep.ai.mit.edu. 

PCL is a freely available implementation of a large subset of CLOS,
the Common Lisp Object System, done at Xerox Corporation.