I created the Graphviz SiteMap Generator to demonstrate how the AT&T/Lucent Bell Labs Graphviz application can be used to generate diagrams such as sitemaps and automate some of the kinds of documents produced during web design. While this tool was created as a proof of concept to illustrate how one kind of diagram can be generated, other diagrams such as network graphs, flow charts, and the like can be generated from tabular data.

Try out the graphviz sitemap generator here. You may download the PHP source code here. You can view screenshots of the application below:

The interface:

Diagram example: