The best Nagios Core alternatives

Checkmk may suit teams monitoring servers, networks, cloud environments, or hybrid infrastructure.

Obkio may suit small businesses, multisite organizations, MSPs, remote users, nonprofits, and colleges or universities.

PRTG is intended for small and medium IT infrastructures, with features for OT and IoT environments.

Domotz may suit managed service providers, IT departments, system integrators, and security professionals managing devices across sites.

The free edition is described as suited to small networks and labs.

Centreon suits IT teams monitoring infrastructure that spans servers, networks, cloud, applications, or edge systems.

It suits organizations that can operate a Linux server and want to monitor infrastructure under configured thresholds.

It may suit IT and DevOps teams, from startups and small businesses to enterprises and government organizations, monitoring network devices and…

NetXMS is intended for network and infrastructure monitoring, as well as application, server, service-provider, payment-switch, and…

It suits IT teams monitoring mixed network, server, application, cloud, and virtualization environments.

LibreNMS is suited to network administrators who want a self-hosted monitoring system with discovery, alerting, and traffic visibility.

Zabbix suits teams monitoring infrastructure, applications, networks, or services across a range of operating systems and data sources.

Cacti suits teams that can self-host network monitoring and need graphing, availability checks, discovery, or distributed data collection.

Community fits home labs, evaluation, and small non-critical deployments.

Flowmon suits organizations that need traffic-based threat detection, network visibility, and performance troubleshooting.