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KisMAC is a wireless network discovery tool for Mac OS X. It has a wide range of features, similar to those of Kismet (its Linux/BSD namesake). The program is geared toward network security professionals, and is not as novice-friendly as similar applications. Distributed under the GNU General Public License, KisMAC is free software.
Some of the major uses of Kismac is testing the network for the weak passwords available, auditing and testing the vulnerabilities in Wi-Fi network and its security level, to localize Hotspots, confirming the channel use, for GPS feature (<3) and basically for playing around.