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Icinga is a monitoring system based on Nagios. It extends its capabilities and delivers new features like libdbi for database abstraction, well written APIs and a new, easy to extend webinterface.
Opsview Core is an open source network monitoring software application that solves the challenges of monitoring modern IT and network systems.
Thruk is a multibackend monitoring webinterface which currently supports Nagios, Icinga and Shinken as backend using the Livestatus addon. See http://www.thruk.org for more.