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Nagios Core vs Monit: catalog facts
Nagios Core	Monit
Free Free and open source. Hosting, hardware and any external services are separate.	Free Monit is free and open source; the separate M/Monit dashboard is a commercial product.
Self-hosted	macOS, Linux, Command line
Runs plugin-based checks Tracks availability and sends notifications	Restarts failed services and acts on resource limits automatically Very small footprint
Configuration and many checks need manual setup or additional plugins.	No Windows support Central management of many hosts needs the paid M/Monit
Self-hosted	Downloadable app
Open source	Open source
License: GPL-2.0	License: AGPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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