OpenWiFiSpots - Hotspot location app
Vistumbler - Vistumbler is a wireless network scanner for Windows Vista and Windows 7. Features:
Wi-Fi Space - Hotspot location app
inSSIDer - inSSIDer Essential makes it easy to maintain small business WiFi.
pttrns - iPhone and iPad user interface patterns
Homedale - With Homedale you can search for Wi-Fi / WLAN Access Points and monitor their signal strength.