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.
Segment Personas - Customer data infrastructure
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
LimeLeads Customer Match - Find prospects similar to your existing customer base
Better Uptime - We call you when your website goes down
Segment - We make customer data simple.