Zabbix - Track, record, alert and visualize performance and availability of IT resources
NetCut - NetCut is a Software that helps you admin your network by purely on ARP protocol.
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
XArp - XArp – Advanced ARP Spoofing Detection XArp performs advanced ARP spoofing detection mechanisms – made to secure your network.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services
TuxCut - TuxCut is a netcut "in Windows OS" like software written in PyQt.