Square has a good solution built on node & mongo called cube (http://square.github.com/cube/ http://square.github.com/cube/). To build custom UIs they wrote ja

Square has a good solution built on node & mongo called cube (http://square.github.com/cube/ http://square.github.com/cube/). To build custom UIs they wrote javascript libraries Crossfilter (http://square.github.com/crossfilter/ http://square.github.com/crossfilter/) & Cubism (http://square.github.com/cubism/ http://square.github.com/cubism/)