cl-dot
CL-DOT is a library for easily generating dot (Graphviz) output from arbitrary Lisp data. Brief overview here, more details can be found in the documentation.

Current Maintainer is Michael Weber.

You may want to check out cl-graphviz and s-dot.

ASDF-install package (obsolete) http://www.foldr.org/~michaelw/projects/cl-dot/cl-dot.tar.gz

graph visualization plotting