Compare software

Naemon vs OpenNMS: catalog facts
Naemon	OpenNMS
Free Free community project.	Freemium Open source core (Horizon) is free, with a paid enterprise edition (Meridian).
Linux, Self-hosted	Self-hosted
Drop-in successor for Nagios users Bug fixes and performance work on the Nagios 4 core	Carrier-grade design proven at large enterprise scale Event correlation and Grafana integration for deeper visualization
Configuration follows the older Nagios style Needs a server to run on	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 not stated	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 22, 2026

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