Nagios (formerly Netsaint) is a daemon written in C that is designed to monitor networked hosts and services. It has the ability to notify contacts (via email, pager or other methods) when problems arise and are resolved. Host and service checks are performed by external "plugins", making it easy to write custom checks in your language of choice. Several CGIs are included in order to allow you to view the current and historical status via a Web browser, and a WAP interface is also provided to allow you to acknowlege problems and disable notifications from an internet-ready cellphone. License: GNU General Public License (GPL) Changes: Bugs were fixed for threading issues under NetBSD, contact address macros, and contact inheritance rules. New object lookup code was added for faster startup times in large installs.

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