inSSIDer - inSSIDer Essential makes it easy to maintain small business WiFi.
OpenWiFiSpots - Hotspot location app
Lizard Systems WiFi Scanner - Lizard Systems WiFi Scanner is a multi purpose WiFi scanner and WiFi troubleshooting tool designed for dealing with all WiFi related issues conveniently.
Wi-Fi Space - Hotspot location app
NetSpot - NetSpot is a free app for wireless site surveys, Wi-Fi analysis, and troubleshooting
pttrns - iPhone and iPad user interface patterns