The Extended Linguistic Dependency Diagrams (xLDDs) is a visualization software package offered by EURAC and implemented in JavaScript using the Protovis tookit. The xLDDs shows dependency structures with dynamic interaction in its visualizations, and can accomodate various types of linguistic information.
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The website for EURAC's LInfoVis project, which produced xLDDs, currently returnes a 401 error for the project's tools and information. The project about page is still active, however, and may be viewed at http://www.eurac.edu/en/research/projects/Pages/projectdetails.aspx?pid=6109&depId=11&pmode=1
You can now directly check this tool through the project page of Linfovis:
http://www.eurac.edu/en/research/autonomies/commul/projects/Pages/Linfovis/programs.aspx#Extendedlinguisticdependency
The links have been fixed.