inSSIDer - inSSIDer Essential makes it easy to maintain small business WiFi.
iBwave Wi-Fi - iBwave Wi-Fi software suite brings smart networking solutions to enterprise, education, hospitality, transportation, retail, office, healthcare, public venues, and residential wireless networks.
NetSpot - NetSpot is a free app for wireless site surveys, Wi-Fi analysis, and troubleshooting
Ekahau Site Survey - Ekahau Site Survey is a flexible wireless site survey software tool that performs automatic wireless coverage calculations and collects detailed information about your wireless network environment.
Wifi Analyzer - Wifi Analyzer is a handy tool which helps you to select a better channel for your wireless router.
Waircut - Free network audit app