MIWIFI by Xiaomi - Wifi router beta with a twist: you build it yourself
NetSpot - NetSpot is a free app for wireless site surveys, Wi-Fi analysis, and troubleshooting
Velop - Whole-home mesh Wi-Fi by Linksys
Vistumbler - Vistumbler is a wireless network scanner for Windows Vista and Windows 7. Features:
Wifi Porter - Connect guests to your network quickly
Wifi Analyzer - Wifi Analyzer is a handy tool which helps you to select a better channel for your wireless router.