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Nagios CoreNaemon
Free

Free and open source. Hosting, hardware and any external services are separate.

 Free

Free community project.

Self-hosted Linux, Self-hosted
  • Runs plugin-based checks
  • Tracks availability and sends notifications
  • Drop-in successor for Nagios users
  • Bug fixes and performance work on the Nagios 4 core
  • Configuration and many checks need manual setup or additional plugins.
  • Configuration follows the older Nagios style
  • Needs a server to run on
Self-hosted Self-hosted
Open source Open source
License: GPL-2.0 License not stated
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked September 22, 2026

Checked September 24, 2026

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