NetSpot - NetSpot is a free app for wireless site surveys, Wi-Fi analysis, and troubleshooting
eero - Blanket your home in fast, reliable WiFi
Vistumbler - Vistumbler is a wireless network scanner for Windows Vista and Windows 7. Features:
Plume - App for writing documents, scripts, books and more.
Wifi Analyzer - Wifi Analyzer is a handy tool which helps you to select a better channel for your wireless router.
MIWIFI by Xiaomi - Wifi router beta with a twist: you build it yourself