Clearbit - Clearbit provides Business Intelligence APIs
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.
LinkedIn Sales Navigator - Sales tool for LinkedIn users.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Clearbit Connect - Clearbit Connect is a free extension that surfaces actionable information on the people who email you.
Better Uptime - We call you when your website goes down