The world's #1 open source monitoring solution. Free network monitoring software for servers, websites, applications, and infrastructure. Trusted by millions for reliable monitoring.
Choose the best Nagios Core download option for your monitoring needs
Download the complete Nagios Core source code. Perfect for experienced system administrators who want full control over their monitoring infrastructure.
Free & Open Source • GPL License
Download NCPA (Nagios Cross-Platform Agent) - the easiest way to start monitoring with Nagios Core. Perfect for beginners and quick deployments.
Free • Windows, Linux, macOS
Comprehensive monitoring tools for server monitoring, network monitoring, and infrastructure monitoring
Monitor servers, workstations, and network devices with comprehensive metrics tracking. Nagios Core provides real-time server monitoring for Linux, Windows, and Unix systems.
Complete network monitoring solution for routers, switches, firewalls, and network services. Monitor network performance and availability 24/7.
Monitor websites, web applications, databases, and custom applications. Ensure your critical applications stay online and perform optimally.
Extend Nagios Core with thousands of community and commercial Nagios plugins. Monitor anything with custom plugins and integrations.
Get instant notifications when issues occur. Nagios Core provides flexible alerting through email, SMS, and custom notification methods.
Nagios Core is completely free and open source monitoring software. No licensing fees, no vendor lock-in, with full access to source code.
Upgrade from Nagios Core to Nagios XI for advanced features and commercial support
Take your monitoring to the next level with Nagios XI's intuitive web interface, advanced visualization dashboards, and enterprise features built on the proven Nagios Core engine.
Pro Tip: Nagios XI has everything Core does, plus extra features that save you time. It’s great if you want reliable monitoring up and running fast without a lot of manual work.
Common questions about Nagios Core monitoring software
Yes, Nagios Core is completely free and open source software released under the GPL license. There are no licensing fees, user limits, or hidden costs. You can download, use, and modify Nagios Core for any purpose.
Nagios Core is the open source monitoring engine with command-line configuration. Nagios XI adds a web interface, advanced dashboards, wizards, and commercial support. XI is built on top of Core.
Nagios Core can monitor unlimited devices. The monitoring capacity depends on your server hardware and configuration. Single instances can monitor thousands of devices, and distributed monitoring allows virtually unlimited scale.
Nagios Core runs on Linux and Unix systems including Red Hat, CentOS, Ubuntu, Debian, SUSE, and more. It can monitor Windows, Linux, Unix, macOS, network devices, and cloud infrastructure from any supported platform.
Join over 1 million users who trust Nagios Core for their infrastructure monitoring needs. Download the world's most popular open source monitoring solution.
Open Source • No Registration Required • Community Supported • 25+ Year Track Record
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