A new product you could take a look at is http://www.jut.io. It's in beta / free for anyone.

It's a streaming analytics development environment, and uses d3 for visualization. It ingests both events and metrics.

It's based on a high-level dataflow processing language that allows you to process your data flexibly (moving window analytics, anomaly detection, general statistical processing). you can build interactive apps & dashboards and control which facets users can manipulate.

aaand here's the disclosure - I work at Jut and run customer success.