Comparison

The OpenNMS Group, Inc. vs Zabbix

The OpenNMS Group, Inc. and Zabbix both land on Depends.

The OpenNMS Group, Inc.

Depends

Confidence: Medium

Built for enterprises running large, distributed networks with dedicated ops staff . the free Horizon edition makes it worth piloting at that scale.

Depends

Confidence: Medium

Zabbix fits orgs with ops staff who need to monitor many servers, network devices, or OT systems . the $0 license is genuine value at scale.

The OpenNMS Group, Inc. versus Zabbix
Compare	The OpenNMS Group, Inc.	Zabbix
Verdict	Depends	Depends
Best for	Large distributed networks	Ops teams monitoring many servers and devices
Who it's not for	Small businesses with a handful of devices	Solo founders wanting one uptime ping
Privacy	Actively maintained: Meridian undergoes penetration testing, but a past code-execution vulnerability required immediate upgrade.^⁸	Open source with a public CVE history; both listed issues are patched . keep versions current.¹⁴
Support quality	Horizon is community-only; paid support via Meridian	Paid support offered; quality unverified
Public sentiment	No substantive user review scores surfaced; Reddit and directory coverage centers on release announcements rather than buyer opinions.¹⁰	The only quotable review in the sources is vendor-published and positive; independent review volume found was thin.¹²
Biggest gotcha	A past vulnerability allowed local and remote code execution and demanded immediate upgrades^⁸	Fixed support pricing replaces licenses, but tier prices aren't public . ask before budgeting¹¹