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OpenNMSNaemon
Freemium

Open source core (Horizon) is free, with a paid enterprise edition (Meridian).

 Free

Free community project.

Self-hosted Linux, Self-hosted
  • Carrier-grade design proven at large enterprise scale
  • Event correlation and Grafana integration for deeper visualization
  • Drop-in successor for Nagios users
  • Bug fixes and performance work on the Nagios 4 core
  • Complexity suited to large networks may be overkill for small setups
  • Paid tiers are needed for enterprise support and advanced features
  • Configuration follows the older Nagios style
  • Needs a server to run on
Self-hosted, Downloadable app Self-hosted
Open source Open source
License not stated 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.