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