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Free Nagios Alternatives

The best free alternative to Nagios is Zabbix, which is also Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Nagios and loads of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Nagios are Netdata, Icinga, Cockpit Project and Cacti.

Nagios alternatives are mainly Network Monitors but may also be Uptime Monitor Services or Website Monitors. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Nagios.
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Nagios iconNagios
  87
  • FreemiumOpen Source
  • Linux

Nagios is a powerful monitoring system that enables organizations to identify and resolve IT infrastructure problems before...

Learn more about Nagios

  1. Zabbix icon

    Zabbix

    • FreeOpen Source
    • Linux
    • Self-Hosted
    • FreeBSD
    • OpenBSD

    Gather and analyze accurate statistics and performance metrics, visualize it, get notified about current and potential issues without delay, and take advantage of our time-tested professional development and support.

    Screenshot
    Zabbix vs Nagios opinions
    Almost everyone thinks Zabbix is a great alternative to Nagios.

    Innovative UI and complex functions.

    Positive comment ago
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  2. Infrastructure-wide health monitoring & performance troubleshooting in one place. Collaborate in the same place as relevant data from your systems and applications, reducing mean time to acknowledge (MTTA), & mean time to resolution. (MTTR).

    Agent dashboard overview
    Netdata vs Nagios opinions
    pros, cons and recent comments

    Super fast monitoring of the system, and also of the monitors the kernel of the system.

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  3. Icinga icon

    Icinga

    • FreemiumOpen Source
    • Mac
    • Linux

    Icinga is a fork of Nagios and is backward compatible. So, Nagios configurations, plugins and addons can all be used with Icinga.

    Screenshot
    Almost everyone thinks Icinga is a great alternative to Nagios.
  4. Cockpit Project icon

    Cockpit Project

    • FreeOpen Source
    • Linux

    Makes it easy to administer Linux servers via a web browser. It allows you to easily perform simple tasks like storage administration, inspecting journals, starting & stopping services, monitoring & administering several servers at once.

    Screenshot
  5. Cacti icon

    Cacti

    • FreeOpen Source
    • Windows
    • Linux

    Cacti is a complete frontend to RRDTool, it stores all of the necessary information to create graphs and populate them with data in a MySQL database. The frontend is completely PHP driven.

    Screenshot
    Most users think Cacti is a great alternative to Nagios.


  6. LibreNMS icon

    LibreNMS

    • FreeOpen Source
    • Linux
    • BSD
    • MySQL Community Edition
    • Apache HTTP Server
    • JavaScript
    • PHP

    LibreNMS is an autodiscovering PHP/MySQL based network monitoring system forked from Observium. LibreNMS aims to be easy to use, painless to deploy, and support monitoring of a wide range of devices.

    Screenshot
    LibreNMS vs Nagios opinions
    pros, cons and recent comments
    Teke2

    So easy to setup, very powerful, and can use the Nagios plugins.

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    Best open source tool that I've tried! Easy to install, manage and low support.

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  7. Join millions of IT professionals and download Spiceworks, a free network monitoring software with network management tools, help desk ticketing app, network mapper and more.

    Screenshot
    Some users think Spiceworks is a great alternative to Nagios, some don't.
  8. PRTG Network Monitor icon

    PRTG Network Monitor

    • FreemiumProprietary
    • Windows
    • Online
    • Software as a Service (SaaS)

    An advanced network monitoring solution to monitor network up/downtime, traffic and usage. Features include availability, performance, and bandwidth monitoring (SNMP, WMI, packet sniffing, NetFlow), instant alerts, reporting, failover clustering.

    Screenshot
    PRTG Network Monitor vs Nagios opinions
    Most users think PRTG Network Monitor is a great alternative to Nagios.

    PRTG is highly flexible and fairly intuitive.

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  9. Cabot icon

    Cabot

    • FreeOpen Source
    • Self-Hosted

    Cabot is a free, open-source, self-hosted infrastructure monitoring platform that provides some of the best features of PagerDuty, Server Density, Pingdom and Nagios without their cost and complexity.

    Preview
  10. Lansweeper icon

    Lansweeper

    • FreemiumProprietary
    • Windows

    Lansweeper discovers Windows, Linux and Mac machines in your network. In addition, it inventories network devices such as Printers, Routers and Switches.

    Screenshot
Showing 10 of 77 alternatives