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Cacti vs OpenNMS: catalog facts
Cacti	OpenNMS
Free Free and open source under the GPL.	Freemium Open source core (Horizon) is free, with a paid enterprise edition (Meridian).
Linux, Web, Self-hosted	Self-hosted
RRDtool storage keeps years of graphs in a fixed amount of disk Mature template and plugin ecosystem for network devices	Carrier-grade design proven at large enterprise scale Event correlation and Grafana integration for deeper visualization
Interface and workflow feel dated next to newer monitoring stacks Alerting requires plugins rather than being built in	Complexity suited to large networks may be overkill for small setups Paid tiers are needed for enterprise support and advanced features
Self-hosted	Self-hosted, Downloadable app
Open source	Open source
License: GPL-2.0	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.