The canonical location for ADW-Charting is http://ryepup.unwashedmeme.com/lisp/adw-charting/. ADW-Charting can be downloaded with quicklisp
adw-charting
ADW-Charting is a simple plotting library for quickly creating nice-looking pie charts and line charts. It presents a function-oriented interface similar to Vecto, and saves results to PNG. Since ADW-Charting and all supporting libraries are written completely in Common Lisp, without depending on external non-Lisp libraries, it should work in any Common Lisp environment. ADW-Charting is available under a BSD-like license.