Smoot – Web-based Ajax Diagram and GIS Tool
http://smoot.sourceforge.net/

Smoot is a Web-based tool for creating diagrams of icons and links between them. Features include Google Maps and Google Earth integration, configurable tool palettes, and automated palette generation from a Google Local query. Smoot is a project of the Children’s Hospital Informatics Program. This has been added to World Wide Web Reference Subject Tracer™ Information Blog.