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Java Wireless Sniffer

• Mobnet is a free, open source wireless ethernet sniffer/analyzer written in Java. It is licensed under the GNU General Public License. It was designed with handheld devices like the iPaq in mind, but will run just as well on a desktop or laptop.
  

• MacStumbler - Wireless scanning tool for the Apple Airport. MacStumbler is a small utility I wrote to emulate the functionality of projects like netstumbler, bsd-airtools, and kismet. It's meant purely for educational or auditing purposes, although many people enjoy using these types of programs to check out how many networks are in their area, usually known as war driving.
  
• KisMAC is a stumbler application for MacOS X, that puts your card into the monitor mode. Unlike most other applications for OS X we are completely invisible and send no probe requests.
  
• iStumbler is a free, open source tool for finding 802.11b & 802.11g wireless networks. iStumbler combines a compact Aqua user interface with visual feedback of signal strength and encryption.
  iStumbler scans by sending out probe packets via an Apple interface Access Points MAY respond to these probes but they might also be configured as private networks.
  

• NetChaser v1.0 - Wireless sniffer for Palm Tungsten C Handheld courtesy by Bits n Bolts.
  

• pocketWiNc™ - is a revolutionary WiFi™ connectivity tool that makes it easier for users to find and connect to WiFi networks, access the internet, and send and receive e-mail.