Vistumbler - Vistumbler is a wireless network scanner for Windows Vista and Windows 7. Features:
Zabbix - Track, record, alert and visualize performance and availability of IT resources
inSSIDer - inSSIDer Essential makes it easy to maintain small business WiFi.
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.
Homedale - With Homedale you can search for Wi-Fi / WLAN Access Points and monitor their signal strength.
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.