EyeOnSite FREE

EyeOnSite is a tool that keeps an eye on your sites or servers to see if they are accessible on the net. The services that can be monitored are http, ftp, smtp and pop3. When a service goes down, you can choose to be alerted with a visual message or an audible alarm. In addition, you can launch an application which can be used to correct the situation or send a message to someone.