Hierarchical Visualizations in R and the Javascript InfoVis Toolkit
If you have not checked out the Javascript InfoVis Toolkit you really should. To get an idea of some of the possibilities available, see Hierarchical Visualizations in R and the Javascript InfoVis Toolkit where Oracle HR Demo Schema data is represented in trees - first in R, then using a Sinatra app and the toolkit. Sinatra app is available on Github.
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