I should mention that Crossfilter and Cube are pretty dead - Mike Bostock, who originally wrote them, has left Square, and apparently they don't use them internally anymore.<p>As somebody else mentioned, DC.js (<a href="http://dc-js.github.io/dc.js/" rel="nofollow">http://dc-js.github.io/dc.js/</a>) is (one) replacement, at least for Crossfilter.
Very cool i've referenced this to a few folks in the past. Here's the demo link BTW <a href="http://square.github.io/crossfilter/" rel="nofollow">http://square.github.io/crossfilter/</a>
And <a href="http://dc-js.github.io/dc.js/" rel="nofollow">http://dc-js.github.io/dc.js/</a> , the end-user friendlier frontend.