Nagios Core is a powerful open source monitoring engine with support for plugins, add-ons, NCPA, Mod-Gearman, and community-driven integrations.

Nagios Core is the monitoring and alerting engine that serves as the primary application around which hundreds of Nagios projects are built.

The original open-source monitoring solution with powerful plugin architecture and community support. Perfect for monitoring network infrastructure, servers, and applications.

Yes, Nagios Core is open source and available under the GPL license. Nagios Core is licensed under the GPL and is distributed as part of the Core Services Platform downloads. It is also available …

Monitor host resources including processor load, disk usage, system logs, and more on Linux, Unix, and Windows systems.

Ready to Start Monitoring? Join thousands of organizations who trust Nagios for their infrastructure monitoring.

With Nagios monitoring tools, you can proactively detect issues, receive instant Nagios alerts, and maintain optimal performance across servers, networks, applications, and critical services.

The Nagios Cross-Platform Agent (NCPA) is an open-source monitoring tool that delivers comprehensive monitoring for Windows, Linux, and Mac OS X. It offers active/passive checks, real …

The Nagios Core Services Platform (CSP) download includes a number of Open Source Nagios monitoring projects in a unified download format.

The official Nagios Plugins package contains dozens of plugins to get you started monitoring all the basics. Extend your monitoring today!