AirPort Utility

AirPort Utility screenshots

Note: Most recent release available only within OS X 10.11 El Capitan update.
AirPort Utility 5.5 : Devices Search Window

Alternative downloads

AirPort Admin Utility for Graphite and Snow
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AirPort is a software supports the original Apple AirPort Graphite and Snow.
Bose SoundLink Air Wi-Fi SetUp Application
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This app allows you to set up the AirPlay feature of your SoundLink Air system.
IOGEAR Printer Sharing Switch
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IOGEAR Printer Sharing Switch enables two Macs to easily share one USB printer.