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.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
AirGrab WiFi Radar - AirGrab WiFi Radar is a WiFi scanning tool that is used for showing information about Apple AirPort based stations and other WiFi connections and access points.
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.
Lizard Systems WiFi Scanner - Lizard Systems WiFi Scanner is a multi purpose WiFi scanner and WiFi troubleshooting tool designed for dealing with all WiFi related issues conveniently.
NetSurveyor - NetSurveyor is an all one network diagnosing and troubleshooting tool for the Windows operating systems.