Proxy SwitchyOmega - Proxy SwitchyOmega is the updated version of the proxy settings for easily switching and managing the multiple proxy servers and files within minutes.
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.
FoxyProxy - FoxyProxy is a set of proxy and proxy switcher to reach the content of international market and easily switch between multiple proxies and proxy servers.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Proxifier - Proxifier extends the advantages of a proxy server to network applications that don't natively support it.
Better Uptime - We call you when your website goes down