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Website Monitoring Software

Nagios Core

Open source monitoring engine for servers, networks and applications

Alerts/Notifications
FTP Monitoring
Mail Server Monitoring
Web-Based, Cloud, SaaS
+3 more

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Nagios Core cover

About Nagios Core

Nagios Core is the open source monitoring engine at the centre of the Nagios family of projects. It checks servers, switches, routers, firewalls, applications and services, and raises alerts when they fail. Its makers describe more than 25 years of experience in monitoring, and it is self-hosted under a GPL licence.

Features

Host and service checks: watches availability, uptime and response time across a network.
Alerting: notifies staff before a fault reaches users.
Plugins: a package of around 50 official plugins, plus thousands of community add-ons.
Agents: NCPA monitors Windows, Linux and Mac machines.
Extensions: web interfaces, auto-discovery scripts and dashboards from the community.

Customers and markets

IT and operations teams running their own infrastructure. Organisations wanting a supported product are pointed to Nagios XI.

Key facts

Licence: GPL, open source
Hosting: Self-hosted
Related products: Nagios XI, Log Server, Fusion
Platforms: Windows, Linux and UNIX applications

Profile written by TrustList from the business's own published information, Oct 2026.

Gallery

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Categories & features

Alerts/Notifications
FTP Monitoring
Mail Server Monitoring
Web-Based, Cloud, SaaS
Webinars
Documentation
Business Hours

Rankings

Website monitoring software › Web based cloud saas#2

As of 2026-10-07. Organic ranks only; sponsored placements are never ranks.

What the business tells TrustList

Delivery: On-premise evidence sent

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