Dashing.io - The exceptionally handsome dashboard framework
Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
Mozaik - Mozaïk is a tool based on nodejs / react / d3 / stylus to easily craft beautiful dashboards.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
amCharts - Advanced javascript charting library that will suit any data visualization need
Better Uptime - We call you when your website goes down