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The Industry Standard in Open Source IT Monitoring Tools.
Free, powerful monitoring and alerting for servers, networks, applications and services.
Nagios Core Services Platform
Everything in one comprehensive package
Why Choose Nagios for IT Monitoring?
Complete Infrastructure Monitoring
Monitor Windows, Linux, networks, and services to prevent downtime before it impacts critical business processes.
Powerful Plugin Architecture
Extend capabilities with thousands of plugins and add-ons including NRPE, NSCA, and custom monitoring solutions.
Enterprise-grade Open Source
Free, community-supported platform with intuitive wizards and dashboards backed by 25+ years of monitoring expertise.
Already using Nagios Core? Upgrade to CSP to unlock enterprise features while keeping it free!
Popular Open Source Projects
Production-ready monitoring trusted by thousands of organizations worldwide.
Nagios Core
The monitoring engine that started it all. Monitor websites, servers, switches, routers, firewalls, ports, applications, metrics, and more.
NCPA (Cross-Platform Agent)
Monitor Windows, Linux, and Mac in real time. NCPA is a cross-platform agent for servers, system metrics, applications, and networks.
Nagios Plugins
50+ ready-made checks packaged with Nagios including check_ping, check_ssh, check_cpu, check_memory, check_linux, and more.
Nagios Mod Gearman
Adds scalability and performance to Nagios Core, enabling users of Nagios Core and XI to effectively monitor large environments.
Nagios Configuration Tools
Web UIs, auto-discovery scripts & change management interfaces to simplify Nagios configuration without manual file editing.
Nagios Visualization Addons
Transform Nagios data into dashboards, network maps & performance graphs for intuitive monitoring and business insights.
Nagios Core Services Platform
Want everything in one comprehensive package? Get all essential Nagios open-source projects plus a pre-configured Nagios XI VM in one unified download.
The Power of Community
Join thousands of users, developers, and contributors who make Nagios the world’s most trusted monitoring solution.
Global Community
Nagios Core is supported by a global community of users, developers, and contributors. They extend its capabilities every day, helping monitor everything from simple setups to complex infrastructure.
Built to Be Shared
Nagios was designed from the start to be open and flexible. That community-driven foundation is what makes it powerful–and why it’s been trusted for over two decades.
Nagios Exchange
Nagios Exchange is home to thousands of community-built plugins, scripts, and add-ons. From servers and networks to applications and services, it makes extending Core easy and accessible.
Resources
Nagios Exchange
Browse thousands of community plugins.
Community Forums
Get help from other Nagios users.
Nagios Library
Search guides, docs, and resourcs.
Training & Certification
Professional training and certification programs.
Plugin Development Guidelines
References for plugin developers.
Nagios Manuals
Online manuals for Nagios projects.
Popular Articles
6 min read
Nagios Core vs Nagios XI
A comparison of features, capabilities, and use cases to help you choose between Nagios Core and Nagios XI for your monitoring needs.
5 min read
Roadmap: Nagios Core to Nagios XI
Step-by-step guide for upgrading from Nagios Core to Nagios XI, including planning considerations and migration best practices.
20 min read
Benefits of Migrating to Nagios XI from Core
Watch this webinar to discover the key advantages of upgrading from Nagios Core to XI, including enhanced features and improved usability.
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