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Cacti vs ManageEngine OpManager: catalog facts
Cacti	ManageEngine OpManager
Free Free and open source under the GPL.	Freemium Free edition for a limited number of devices, with paid tiers for larger networks.
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	Covers fault, performance and configuration management in one console Free tier makes it accessible for monitoring smaller networks
Interface and workflow feel dated next to newer monitoring stacks Alerting requires plugins rather than being built in	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	Self-hosted, Downloadable app
Open source	Closed 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.