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Naemon vs Nagios Core: catalog facts
Naemon	Nagios Core
Free Free community project.	Free Free and open source. Hosting, hardware and any external services are separate.
Linux, Self-hosted	Self-hosted
Drop-in successor for Nagios users Bug fixes and performance work on the Nagios 4 core	Runs plugin-based checks Tracks availability and sends notifications
Configuration follows the older Nagios style Needs a server to run on	Configuration and many checks need manual setup or additional plugins.
Self-hosted	Self-hosted
Open source	Open source
License not stated	License: GPL-2.0
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.