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.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
UptimeRobot - Free Website Uptime Monitoring
ManageEngine RecoveryManager Plus - RecoveryManager Plus is one such enterprise backup solution which has the ability to easily backup and restores both the domain controllers and virtual machines.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Lastpass - LastPass is an online password manager and form filler that makes web browsing easier and more secure.