Grafana - Data visualization & Monitoring with support for Graphite, InfluxDB, Prometheus, Elasticsearch and many more databases
Smashing - Smashing is a fork of Dashing (which is no longer maintained), a Sinatra based framework that lets you build beautiful dashboards.
Mozaik - Mozaïk is a tool based on nodejs / react / d3 / stylus to easily craft beautiful dashboards.
Dashing.io - The exceptionally handsome dashboard framework
freeboard - An open source real-time dashboard builder for IOT and other web mashups.
amCharts - Advanced javascript charting library that will suit any data visualization need