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Screenshots for different Nagios products are available below. There are a number of alternative frontends that offer different features and can change the look of Nagios.
Nagios XI Screenshots
Nagios XI is a commercial monitoring solution that is built on Nagios Core and includes dashboards, web-based configuration, advanced reporting, and rich data visualizations.
Nagios Core Screenshots
Nagios Core is a free, Open Source monitoring engine that provides basic alerting and reporting capabilities.