Nagios Xi License Key Free [better] -

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If you need to test Nagios XI at scale, the Nagios XI Free Trial offers a temporary license key with no node restrictions. Nagios FAQ | Nagios Open Source nagios xi license key free

While intended for personal/non-commercial use, some sources indicate it can be used in small commercial settings. Nagios XI Free Options: Licenses, Trials, and Core

This license is free forever and does not expire. Nagios XI Free Options: Licenses