StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
The Data Visualisation Catalogue - Reference tool for data visualisation
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.
Flourish - Powerful, beautiful, easy data visualisation
UptimeRobot - Free Website Uptime Monitoring
nivo - nivo provides a rich set of dataviz components