WiFi Scanner is the most feature rich and complete WiFi scanning app on the app store and is a great tool for personal use and for IT professionals. All features available on 10.6 and later (Snow Leopard, Lion, Mountain Lion, and Mavericks)
WiFi Scanner is an 802.11 / WiFi wireless scanner and connection manager for 802.11 a/b/g/n/ac networks. WiFi Scanner is an easy to use tool for designing, verifying, and troubleshooting WiFi coverage. The tool provides information such signal strength, noise, manufacturer name based on MAC address prefix of device (OUI), and AP channel assignments for WiFi access points and allows the generation of reports for saving and sharing with others.
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