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Nagios XI is the easy-to-use, enterprise version of Nagios that features:
Nagios Core is fully capable of monitoring SNMP through both SNMP traps and active polling.
There are hundreds of community-contributed SNMP addons and projects on Nagios Exchange. Here are a few links to SNMP projects and categories that are most useful when integrating SNMP traps with Nagios Core:
Many people ask how Nagios Core compares to OpenNMS when it comes to SNMP monitoring, SNMP trap integration, and other features. Read How Nagios Compares To OpenNMS