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OpenNMS vs ManageEngine OpManager: catalog facts
OpenNMS	ManageEngine OpManager
Freemium Open source core (Horizon) is free, with a paid enterprise edition (Meridian).	Freemium Free edition for a limited number of devices, with paid tiers for larger networks.
Self-hosted	Self-hosted
Carrier-grade design proven at large enterprise scale Event correlation and Grafana integration for deeper visualization	Covers fault, performance and configuration management in one console Free tier makes it accessible for monitoring smaller networks
Complexity suited to large networks may be overkill for small setups Paid tiers are needed for enterprise support and advanced features	Larger networks require paid tiers to unlock full device and feature limits Proprietary software, so you cannot inspect or modify the underlying code
Self-hosted, Downloadable app	Self-hosted, Downloadable app
Open source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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