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LibreNMS is an open-source network monitoring tool that can monitor a wide range of network devices and also different operating systems such as Linux, Windows as well and pretty much anything that supports SNMP polling.

The top features of LibreNMS monitoring tool:

Automatic Discovery – It will automatically discover your entire network using CDP, FDP, LLDP, OSPF, BGP, SNMP, and ARP.
Customizable Alerting – Supports a customizable alerting system to send notifications through email, IRC, slack, and more.
Customizable Dashboards – It has a mobile-friendly Web UI, with customizable dashboards.
Integration Support – Supports integration with NfSen, collected, SmokePing, RANCID, and Oxidized.
Multiple Authentication Methods – Supports multiple authentication methods such as MySQL, HTTP, LDAP, Radius, and Active Directory.
Billing system – Easily generate bandwidth bills for ports on your network based on usage or transfer.
API Access – Supports an API for managing, graphing, and retrieving data from your system.
Automatic Updates – With LibreNMS you get to stay up to date automatically with new features and bug fixes.