I've been working on something similar, Here's the list of candidates I have so far...

This was just posted but it has some useful info. http://chartio.com/blog/2013/08/informationdashboarddesign

The D3 charting library has some really unusual diagrams that seem like they would add an extra dimension to a dashboard. https://github.com/mbostock/d3/wiki/Gallery

Kibana 3 looks like it could be useful, It also led me to the Logstash library which looks helpful. http://three.kibana.org

I've not built the system yet so I don't have much practical experience with these libraries, but they seem like my leading candidates for the display side of the project.