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Nagios Core is a free, open-source IT infrastructure monitoring tool that provides comprehensive monitoring of your entire environment, including websites, DNS, servers, network devices, services, and applications. It is licensed under GPL v2 and highly extensible with thousands of community plugins and integrations, with full access to the source code for customization. It is described as the #1 open-source monitoring solution for IT, widely used by organizations worldwide, and can be complemented by commercial products like Nagios XI for an enhanced GUI and professional support.
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