NetSpot - NetSpot is a free app for wireless site surveys, Wi-Fi analysis, and troubleshooting
Starry - A touchscreen Wi-Fi router and radical Internet service
Vistumbler - Vistumbler is a wireless network scanner for Windows Vista and Windows 7. Features:
eero - Blanket your home in fast, reliable WiFi
Wifi Analyzer - Wifi Analyzer is a handy tool which helps you to select a better channel for your wireless router.
WiFi Map - A crowdsourced list of routers and passwords