cl-modlisp provides the Lisp side of the interface to Marc Battyani's mod_lisp apache module (http://www.fractalconcept.com).
apt-get install libapache-mod-lisp cl-modlisp cl-kmrcl
If you are not using Debian, you will need to download and install mod_lisp, cl-modlisp, and cl-kmrcl manually.
The demo.lisp file for some examples of using cl-modlisp.