Alternatives to OpenNMS
Carrier-grade open-source network monitoring platform with event correlation. The listings below can replace it for an important use case. Each note says what changes if you switch.
The original
OpenNMS
Carrier-grade open-source network monitoring platform with event correlation.
Replacements
Listings that take over the same core job as OpenNMS.
Zabbix
Enterprise-scale open-source monitoring for networks and applications.
Zabbix is free under AGPL-3.0 and scales with proxies to tens of thousands of devices with a large template library, though its configuration is extensive.
LibreNMS
Discover and monitor network equipment from a central server.
LibreNMS is free under GPL-3.0 and centres on discovering network equipment with alerting and historical graphs, with visibility depending on supported protocols and credentials.
NetXMS
Monitor network devices, servers and infrastructure through a central platform.
NetXMS is open source and monitors network devices, servers and infrastructure through a central platform, with enterprise services and editions under separate terms.
Checkmk
Hybrid open-source and commercial monitoring with agent-based and SNMP auto-discovery.
Checkmk adds agent-based and SNMP auto-discovery to reduce manual setup, while advanced features and scaling are gated behind its paid commercial editions.
PRTG Network Monitor
Sensor-based network monitoring, free for the first 100 sensors.
PRTG is closed source and runs on a Windows server, with 100 free sensors and autodiscovery, maps and alerting in one interface, but per-sensor licensing gets expensive.
SolarWinds Network Performance Monitor
Industry-standard self-hosted network performance monitor with intelligent maps.
SolarWinds Network Performance Monitor is proprietary and paid, offering NetPath and intelligent maps for network path visibility, and needs dedicated infrastructure for its self-hosted deployment.
Observium
Autodiscovering network monitoring platform with a clean interface.
Observium is not open source; autodiscovery adds devices with graphs and inventory automatically, but alerting and some features are in the subscription edition.
Centreon
French enterprise network and IT monitoring platform with business activity dashboards.
Centreon is a French enterprise platform adding business activity views that tie infrastructure health to business impact, with features split across free and paid editions.
Also worth comparing
These listings name OpenNMS as their own alternative, so the relationship runs both ways.
Cacti
RRDtool-based graphing and monitoring for network devices.
OpenNMS is a carrier-grade platform with event correlation and Grafana integration, but its complexity may be overkill for small networks and support needs paid tiers.
Icinga 2
Monitor infrastructure availability with a configurable checking and alerting system.
OpenNMS brings carrier-grade event correlation and Grafana integration, but its complexity may be overkill for small setups and paid tiers cover enterprise support.
ManageEngine OpManager
Zoho's network monitoring software for routers, switches and hybrid infrastructure.
OpenNMS is open source with carrier-grade event correlation, but complexity may be overkill for small networks and enterprise support is paid.
Naemon
Community-run network and host monitoring suite built on the Nagios 4 core.
OpenNMS is an open-source platform with event correlation and Grafana integration, built for large networks and possibly overkill for small setups.
Nagios Core
Monitor hosts and services with a configurable alerting engine.
OpenNMS adds carrier-grade event correlation and Grafana integration, though its complexity suits large networks more than small setups.
Pandora FMS
A monitoring platform for servers, networks, applications and logs, with an open-source edition.
OpenNMS is open-source network monitoring with event correlation and Grafana integration, suited to large networks, with paid tiers for enterprise support.
Similar software
Related functionality, not a direct replacement.
Grafana
Dashboard and visualization front end for metrics, logs and traces.
Prometheus
Metrics database that scrapes targets and evaluates alerting rules.
SmokePing
Latency measurement and visualisation over time.
