Cytoscape's demos[1] look amazing! Also nice to see its library comes with a few graph algorithms[2] implemented.

Thanks for sharing.

[1] http://js.cytoscape.org/

[2] http://js.cytoscape.org/#collection/algorithms

It's pretty heavy but on the other hand they pretty much cover every use case you would be able to think of within its own API. For that it's kind of nice.