Nagios is the monitoring tool with multitude of features as given below −
Nagios Core is open source, hence free to use.
Powerful monitoring engine which can scale and manage 1000s of hosts and servers.
Comprehensive web dashboard giving the visibility of complete network components and monitoring data.
It has multi-tenant capabilities where multiple users have access to Nagios dashboard.
It has extendable architecture which can easily integrate with third-party applications with multiple APIs.
Nagios has a very active and big community with over 1 million + users across the globe.
Fast alerting system, sends alerts to admins immediately after any issue is identified.
Multiple plugins available to support Nagios, custom coded plugins can also be used with Nagios.
It has good log and database system storing everything happening on the network with ease.
Proactive Planning feature helps to know when it’s time to upgrade the infrastructure.