The Open Source Standard In Monitoring

Nagios Core is our original open-source monitoring solution, developed for and supported by hundreds of community members. Create your ideal monitoring and alerting tool with a flexible and extensible monitoring architecture.

Over 10,000 users trust Nagios to monitor their environment. No matter the industry, you can accomplish it all with Nagios.

Nagios Commercial Solutions

Nagios XI

Monitor your entire IT infrastructure quickly with the most powerful monitoring solution on the market.


Nagios Log Server

Quickly and easily view, analyze, and archive logs from any source in one central location.

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Nagios Network Analyzer

See where your bandwidth is dipping or spiking with our commercial grade netflow data analysis solution.

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Nagios Fusion

Using Nagios Fusion you gain a centralized visual operational status and enables faster problem resolution over your entire network.


Nagios Add-on Products

Extend Core’s functionality with Nagios agents. You can retrieve
the code for any of these agents from our GitHub.

Nagios Cross Platform Agent

A cross-platform monitoring agent that can be installed on Windows, Linux/Unix, and Mac OS/X machines. NCPA features active and passive checks, remote management, and a local monitoring interface. 

Nagios Remote Plugin Executor

An agent that allows you to remotely execute Nagios plugins on Linux/Unix machines and  monitor remote machine metrics (disk usage, CPU load, etc.). NRPE can also communicate with Windows agent add-ons like NSClient++, so you can check metrics on remote Windows machines. 

Nagios Remote Data Processor

NRDP is a flexible data transport mechanism and processor for Nagios that uses standard port protocols (HTTP(S) and XML) and can be implemented as a replacement for NSCA. Designed with a simple and robust architecture, NRDP can be easily extended and customized to fit individual users’ needs.  

Nagios Data Output Utilities

NDOUtils is an add-on that lets you store current and historical status and event information from one or more Nagios instances on a MySQL/MariaDB database. Several community add-ons use this as one of their data sources. 

Nagios Service Check Acceptor

NSCA allows you to integrate passive alerts and checks from remote machines and applications with Nagios. This agent is useful for processing security alerts as well as deploying redundant and distributed Nagios setups.