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.
Blue Iris - Blue Iris is a high end security monitoring system that lets you view and control the feeds from all the cameras at your home or place of business.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
ZoneMinder - ZoneMinder is a free and open-source piece of security software that can be used at home or in your business. The software puts you in control of all of your data, and it is exceptionally easy to setup. Read more about ZoneMinder.
Better Uptime - We call you when your website goes down
motionEyeOS - A Video Surveillance OS For Single-board Computers