TreeMapping is an ingenious means of visualising hierarchic values. Often used to answer the question "Where has all my disk space gone?" it lends itself naturally to many data models, even if the hierarchy is artificial.
The Treemap can also make use of an adapter object to fit existing (and sometimes large) data models, in an XML DOM for example.
While not exhaustive by any means, the following platforms have all run Js-Treemap sucessfully