HTML5 Graph Visualization Library using Web Workers and jQuery: Arbor.JS

Arbor.JS is an interesting HTML5 graph visualisation library built using Web Workers and jQuery.

Rather than trying to be an all-encompassing framework, arbor provides an efficient, force-directed layout algorithm plus abstractions for graph organization and screen refresh handling.

It leaves the actual screen-drawing to you. This means you can use it with canvas, SVG, or even positioned HTML elements.