Check Point Firewall Software Blade - Check Point delivers the best security solutions withthe right architecture to prevent attacks in allof yourenvironments.
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.
pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
ClearOS - A very good alternative for Windows Server, for free
Better Uptime - We call you when your website goes down