Alternatives to Nagios Core

Checkmk

Checkmk suits teams monitoring infrastructure across cloud, hybrid, and data center environments, including servers, networks, and containers.

ManageEngine OpManager

OpManager suits teams monitoring network devices and servers in a self-hosted deployment.

Nagios XI

Nagios XI suits teams that want to host monitoring on their own Linux infrastructure and need configurable checks, notifications and access controls.

Domotz

Domotz identifies managed service providers, IT departments, system integrators and security professionals as users.

Cacti suits administrators who can run self-hosted monitoring on Linux/Unix or Windows.

Paessler PRTG Network Monitor

Paessler describes PRTG as suited to small and medium IT infrastructures, with features for OT and IoT environments.

LibreNMS

LibreNMS suits teams or administrators seeking self-hosted network monitoring with device discovery, alerting, and scaling options.

NetXMS

NetXMS suits teams monitoring networks, infrastructure, applications, servers, service-provider environments, payment systems, or industrial equipment.

WhatsUp Gold suits IT teams monitoring mixed on-premises and cloud infrastructure, including virtualized environments.

Observium

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

It suits IT and DevOps teams seeking centralized network monitoring, from small setups through enterprise environments.

Progress Flowmon

Flowmon is for organizations needing network visibility, security detection, and performance analysis.

Zabbix

Zabbix suits organizations monitoring infrastructure, applications, networks or services across varied data sources.