I've been using shopify/dashing for metrics display: http://shopify.github.io/dashing/ http://shopify.github.io/dashing/ You can post JSON directly to each wi

I've been using shopify/dashing for metrics display: http://shopify.github.io/dashing/ http://shopify.github.io/dashing/ You can post JSON directly to each widget. It's also based on Sinatra. Someone already created a widget for Rickshaw graphs, I suppose it could be adapted to use D3.js.