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.
Registry Workshop - Registry Workshop is an advanced registry editor.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
RegCool - RegCool is an advanced registry editor.
Better Uptime - We call you when your website goes down
Registrar Registry Manager - Advanced Registry Manager for Windows