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OpenNMS vs NetXMS: catalog facts
OpenNMS	NetXMS
Freemium Open source core (Horizon) is free, with a paid enterprise edition (Meridian).	Freemium The open-source edition is free; enterprise capabilities and services are available…
Self-hosted	Self-hosted
Carrier-grade design proven at large enterprise scale Event correlation and Grafana integration for deeper visualization	Collects device and agent data Provides monitoring and management interfaces
Complexity suited to large networks may be overkill for small setups Paid tiers are needed for enterprise support and advanced features	Enterprise services and editions have separate terms.
Self-hosted, Downloadable app	Self-hosted
Open source	Open source
License not stated	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.