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Comparison

Nagios Open Source vs The OpenNMS Group, Inc.

Nagios Open Source and The OpenNMS Group, Inc. both land on Depends.

Nagios Open Source versus The OpenNMS Group, Inc.
CompareNagios Open SourceThe OpenNMS Group, Inc.
VerdictDependsDepends
Best forHands-on sysadmin teamsLarge distributed networks
Who it's not forTeams without time to edit config filesSmall businesses with a handful of devices
PrivacyPublicly disclosed and patched vulnerabilities exist; no unpatched crisis in evidence . patch promptly.⁹Actively maintained: Meridian undergoes penetration testing, but a past code-execution vulnerability required immediate upgrade.
Support qualityNo Core support evidence foundHorizon is community-only; paid support via Meridian
Public sentimentAdmins rate Core 7.7/10 on TrustRadius across 172 reviews, but Reddit chatter questions how much attention the free version still gets.²No substantive user review scores surfaced; Reddit and directory coverage centers on release announcements rather than buyer opinions.
Biggest gotchaCore is free, but many features live in paid XI; Reddit users complain the open version lags⁶A past vulnerability allowed local and remote code execution and demanded immediate upgrades

Pick Nagios Open Source when

  • Hands-on sysadmin teams
  • Self-hosters on a $0 budget
  • Very large infrastructures (100k+ hosts)
  • Linux-centric shops

When Nagios Open Source is not a fit

  • Teams without time to edit config files
  • Anyone wanting modern dashboards out of the box
  • Buyers needing vendor SLA support
  • Non-technical ops staff wanting one-click setup

Pick The OpenNMS Group, Inc. when

  • Large distributed networks
  • Enterprises with dedicated network ops teams
  • Fortune 100-scale infrastructure
  • Teams avoiding vendor lock-in

When The OpenNMS Group, Inc. is not a fit

  • Small businesses with a handful of devices
  • Teams without dedicated network admins
  • Anyone wanting plug-and-play hosted monitoring
  • Non-technical users needing fast dashboards

Sources

  1. Nagios Core | The #1 Open Source Monitoring Solutionnagios.org
    official
  2. Nagios Core Reviews . TrustRadiustrustradius.com
    review
  3. Nagios Open Source . SourceForge reviewssourceforge.net
    review
  4. Comparative Analysis of Nagios and OpenNMSacademia.edu
    review
  5. Using Nagios as a Groundwork for Better Network Monitoringacademia.edu
    review
  6. Is Nagios now mostly commercial and a lot less open? . Redditreddit.com
    review
  7. Install Nagios on Ubuntu 20.04cloudinfrastructureservices.co.uk
    review
  8. Nagios Security Disclosuresnagios.com
    security
  9. Nagios Core 4.x Changelognagios.org
    security
  10. Nagios web interface unauthorized access . Vigilance.frvigilance.fr
    security
  11. Nagios XI pricing . Nagios.comnagios.com
    official
  12. Edeka case study (Checkmk, formerly Nagios)checkmk.com
    review
  13. Nagios: Open-source monitoring solution . Help Net Securityhelpnetsecurity.com
    news
  14. Nagios . ithub.directory profileithub.directory
    review
  15. NantHealth Acquires OpenNMStechnologynetworks.com
    news
  16. OpenNMS Group company profilesystem.privco.com
    official