Checker Plus for Gmail - Displays new emails and the sender's contact photo, get notifications or even listen, read or...
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.
Mia for Gmail - A desktop email client for your Mac, without a browser !
UptimeRobot - Free Website Uptime Monitoring
POP Peeper - POP Peeper is an email notifier that runs in your Windows task bar and alerts you when you have new...
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring