Nagios
Open SourceNagios Core is a powerful, open-source monitoring system designed to keep a vigilant eye on your IT infrastructure. It provides comprehensive surveillance of systems, networks, and hardware, ensuring critical services remain operational and alerting administrators to potential issues before they impact end-users.
Key Features
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Free and open source, no licensing costs.
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Highly extensible through a vast plugin ecosystem.
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Provides granular control over monitoring and alerting.