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OpenNMS vs LibreNMS: catalog facts
OpenNMS	LibreNMS
Freemium Open source core (Horizon) is free, with a paid enterprise edition (Meridian).	Free Free and open source. Hosting, hardware and any external services are separate.
Self-hosted	Self-hosted
Carrier-grade design proven at large enterprise scale Event correlation and Grafana integration for deeper visualization	Collects device information and performance data Provides alerting and historical graphs
Complexity suited to large networks may be overkill for small setups Paid tiers are needed for enterprise support and advanced features	Device visibility depends on supported protocols and credentials.
Self-hosted, Downloadable app	Self-hosted
Open source	Open source
License not stated	License: GPL-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.