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Zabbix vs OpenNMS: catalog facts
Zabbix	OpenNMS
Free Free and open source under the AGPL. Support and services are paid.	Freemium Open source core (Horizon) is free, with a paid enterprise edition (Meridian).
Linux, Web, Self-hosted	Self-hosted
Scales to tens of thousands of monitored devices with proxies Large template library covering common hardware and services	Carrier-grade design proven at large enterprise scale Event correlation and Grafana integration for deeper visualization
Configuration is extensive; the learning curve is real Interface density makes simple setups feel heavy	Complexity suited to large networks may be overkill for small setups Paid tiers are needed for enterprise support and advanced features
Self-hosted	Self-hosted, Downloadable app
Open source	Open source
License: AGPL-3.0	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.