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OpenNMS vs Cacti: catalog facts
OpenNMS	Cacti
Freemium Open source core (Horizon) is free, with a paid enterprise edition (Meridian).	Free Free and open source under the GPL.
Self-hosted	Linux, Web, Self-hosted
Carrier-grade design proven at large enterprise scale Event correlation and Grafana integration for deeper visualization	RRDtool storage keeps years of graphs in a fixed amount of disk Mature template and plugin ecosystem for network devices
Complexity suited to large networks may be overkill for small setups Paid tiers are needed for enterprise support and advanced features	Interface and workflow feel dated next to newer monitoring stacks Alerting requires plugins rather than being built in
Self-hosted, Downloadable app	Self-hosted
Open source	Open source
License not stated	License: GPL-2.0
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.