Nagios Core
Run host, service and network checks with a long-established self-hosted monitoring core.
What’s included for free?
The Core engine is free with no monitored-host quota. Plugins, infrastructure, UI choices and paid Nagios products are separate.
Where it runs: Self-hosted
Provider information ↗Checked 2026-10-30
Before you use it
GPL-2.0.
Provider terms can change. Check current pricing and usage rights before starting a project.