The JIT is an advanced JavaScript infovis toolkit that was based on 5 papers regarding different information visualization techniques. The JIT implements advanced features of information visualization like Treemaps (with theslice and dice and squarified methods), an adapted visualization of trees based on theSpacetree, a focus+context technique to lay Hyperbolic Trees, and a radial layout of trees with advanced animations (RGraph).

Some very nifty tools here:http://blog.thejit.org/?page_id=14

In particular, check out the spacetree demo 

Also a nice bibliography.