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Nagios is a comprehensive solution for real-time monitoring of critical infrastructure elements, including applications, services, operating systems, network protocols, system metrics and network infrastructure. With the support of hundreds of third-party addons, it offers a versatile platform for tracking virtually all in-house and external systems and services.

Nagios - The Industry Standard In IT Infrastructure Monitoring
Nagios provides enterprise-class Open Source IT monitoring, network monitoring, server and applications monitoring. Download Nagios Today!


The core strength of Nagios is its distinctive architecture that is honed for scalability and flexibility. It provides multiple APIs to enable easy expansion of its features through addons. This extensible model has proven its worth by fostering the development of thousands of addon projects that augment Nagios' fundamental feature set.

Uniquely focused on tasks such as check scheduling, check execution, check processing, event handling and alerting, Nagios Core's scope extends beyond other similar platforms. While tasks like performing checks and sending notifications are generally handled by other Nagios projects, Nagios Core's robust framework addresses these out-of-scope areas efficiently.

With 1305 GitHub stars and the latest commit on 2023-07-19 the project looks healthy.