Nagios is a comprehensive monitoring system much like Big Brother, However, the initial installation and setup require the skills of an experienced systems administrator. Nagios helps systems and network administrators identify and resolve IT infrastructure problems. Designed with scalabilityand flexibility in mind, Nagios gives you that warm fuzzy feeling that comes from knowing your business critical processes won't be affected by unknown outages.

It has all of the expected display features like a status overview, a map view, an alerts screen, and many other views.