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.
CSArp-Netcut - An arpspoofing program that lets users launch spoofed arp requests to disrupt connections in a LAN
Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
SelfishNet - Block anyone or any device from using your internet