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OpenNMS vs Centreon: catalog facts
OpenNMS	Centreon
Freemium Open source core (Horizon) is free, with a paid enterprise edition (Meridian).	Freemium Free community edition with paid enterprise tiers for advanced features and support.
Self-hosted	Self-hosted
Carrier-grade design proven at large enterprise scale Event correlation and Grafana integration for deeper visualization	Business activity views connect infrastructure health to business impact Self-hosted deployment keeps monitoring data under your own control
Complexity suited to large networks may be overkill for small setups Paid tiers are needed for enterprise support and advanced features	Full feature set is split across free and paid enterprise editions Enterprise-oriented tooling can be heavier to set up than lightweight monitors
Self-hosted, Downloadable app	Self-hosted, Downloadable app
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.