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.
Vistumbler - Vistumbler is a wireless network scanner for Windows Vista and Windows 7. Features:
AppDynamics - Get real-time insight from your apps using Application Performance Management—how they’re being used, how they’re performing, where they need help.
inSSIDer - inSSIDer Essential makes it easy to maintain small business WiFi.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Homedale - With Homedale you can search for Wi-Fi / WLAN Access Points and monitor their signal strength.