X
If you're looking for information on how to get started with Nagios XI or Nagios Core, here are some steps:
Zabbix is an enterprise-class, open-source monitoring solution that is completely free to use without any node restrictions.
For the most accurate and up-to-date information on Nagios XI licensing, I recommend visiting the official Nagios website or contacting their sales team directly. They can provide detailed information on the available options, including any potential free trials or community editions that might be available.