It does not need any third-party tools from Adobe or others.
It is released with a BSD-style license.
The CL-PDF home page: http://www.fractalconcept.com/asp/cl-pdf
There are mailing lists and a code repository now. See home page for details.
CL-PDF is used by cl-typesetting, a Common Lisp typesetting engine.
Current Tarball: 2.1 (08-Feb-2003)
For current version: svn checkout http://www.fractalconcept.com:8000/public/open-source/cl-pdf