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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.
A complete availability monitoring solution that ensures IT infrastructure uptime while identifying issues before they become real problems. Unifies proven open source tools - Nagios, Nmap, sendpage, PHP, Apache, MySQL and more - through PHP/AJAX-based components and an integrated user interface to deliver the extensible functionality you require.
Mod_Gearman is an easy way of distributing active Nagios checks across your network and increasing nagios scalability. Mod-Gearman can even help to reduce the load on a single nagios host, because its much smaller and more efficient in executing checks.