I don't know where my servers are all the time or I mean when they are up and running or not but with DreamSys Server Monitor I can. If they are down, there are a number of actions that will remedy the situation. At a scheduled time, it will check the servers to see if they're still running and you can manually check the servers at any time.
The range of actions in response to a problem server include sending an e-mail as a notification, rebooting the machine, starting a service, or playing a sound or running a command.
The GUI is a bit problematic but with a bit of patience it can be overcome if this looks like a useful tool.