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OpenNMS is the world’s first enterprise grade network management application platform developed under the open source model.

Icinga is an enterprise grade open source monitoring system which keeps watch over networks and any conceivable network resource, notifies the user of errors and recoveries and generates performance data for reporting. Scalable and extensible, Icinga can monitor complex, large environments across dispersed locations.

Munin is a networked resource monitoring tool that can help analyze resource trends and "what just happened to kill our performance?" problems. It is designed to be very plug and play. A default installation provides a lot of graphs with almost no work.

Naemon is the new monitoring suite that aims to be fast, stable and innovative while giving you a clear view of the state of your network and applications.