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OpenWiFiSpots - Hotspot location app
inSSIDer - inSSIDer Essential makes it easy to maintain small business WiFi.
Wi-Fi Space - 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.
NetSpot - NetSpot is a free app for wireless site surveys, Wi-Fi analysis, and troubleshooting