Grafana

Grafana allows you to query, visualize, alert on and understand your metrics no matter where they are stored. Create, explore, and share dashboards with your team and foster a data driven culture. - grafana.com
Grafana is the de facto standard when it comes to visualizing time series data.
What makes it so good?
- Looks good
- Works with almost every TSDB out there
- Dashboard templates
- Easy to run and support