UptimeRobot - Free Website Uptime Monitoring
NetBox - NetBox is an open source web application designed to help manage and document computer networks. NetBox was developed specifically to address the needs of network and infrastructure engineers.
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.
Storagepipe - Automating archiving older emails
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
vSphere Hypervisor - Get a free vSphere Hypervisor by VMware to consolidate your applications and virtualize your servers. Learn how to optimize your server’s performance