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
CSArp-Netcut - An arpspoofing program that lets users launch spoofed arp requests to disrupt connections in a LAN
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.
SelfishNet - Block anyone or any device from using your internet
Nagios - Complete monitoring and alerting for servers, switches, applications, and services