NetCut - NetCut is a Software that helps you admin your network by purely on ARP protocol.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
XArp - XArp – Advanced ARP Spoofing Detection XArp performs advanced ARP spoofing detection mechanisms – made to secure your network.
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.
Paessler PRTG - An advanced network monitoring solution to monitor network up/downtime, traffic and usage.
Prometheus - An open-source systems monitoring and alerting toolkit.