OpenWiFiSpots - Hotspot location app
NetSpot - NetSpot is a free app for wireless site surveys, Wi-Fi analysis, and troubleshooting
Wi-Fi Space - Hotspot location app
Vistumbler - Vistumbler is a wireless network scanner for Windows Vista and Windows 7. Features:
pttrns - iPhone and iPad user interface patterns
Wifi Analyzer - Wifi Analyzer is a handy tool which helps you to select a better channel for your wireless router.