Capistra lets you manage & monitor all your server from a single place.
The only thing you have to do is install the Capistra client on each server you own, and then they'll be automagically imported to your account, ready to manage & monitor.
Capistra is smart enough to alert you if something is on its way to going wrong (RAM usage increasing rapidly, meaning a system crash might occur soon), or if a server just has crashed. Through the mobile app, you can get an alarm to wake you up at night in case of crash/downtime.
Capistra also lets you to get live server stats (resources, history graphs) from the Web dashboard, similar to the "htop" command but in a beautiful manner.
Plus, it lets you execute batch commands and massive server updates, and offers you a cloud terminal access (shell access from the Web dashboard).