Nagios is a powerful network services monitoring tool. It was previously called NetSaint.

It features a lot of agents to monitor a lot of service types and report it several ways, like SMS, web interface, e-mail, print, …. It is easily extensible by custom-made modules written in a lot of languages.

You can find a lot of screenshots here:

This article was first written in June 2003 for the
BeezNest technical website (

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