Did you search cpan?
Did you? I gave it a quick look, trying various keywords.
I figured there'd be a module using "GraphViz" set up to do something like this, but I didn't see anything. Nor did I spot anything that looked good under searches on terms like
"Flow", and "Chart" and so on. It's entirely possible I missed something of course, but then it's also entirely understandable to me why someone would ask a question like this.
It's not like we've got any really good conceptual indexes to CPAN, you know... pretty much you have to hope the other guy named something the way you would've.