Airbase
Included in airbase you will find an aircrack re-implementation, a distributed wep cracker (now with FPGA support), a library to help you craft/parse 802.11 packets, and various other supporting utilities. At the core of airbase is a C++ library called libairware. It does as much boring work related to 802.11 as it can (and I'm still working on it).
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Wireshark
Wireshark (known as Ethereal until a trademark dispute in Summer 2006) is a fantastic open source network protocol analyzer for Unix and Windows. It allows you to examine data from a live network or from a capture file on disk. You can interactively browse the capture data, delving down into just the level of packet detail you need. Wireshark has several powerful features, including a rich display filter language and the ability to view the reconstructed stream of a TCP session. It also supports hundreds of protocols and media types.
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Wifitap
Wifitap is a proof of concept for communication over WiFi networks using traffic injection.
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tcpdump - dump traffic on a network
Tcpdump prints out the headers of packets on a network interface that match the boolean expression. It can also be run with the -w flag, which causes it to save the packet data to a file for later analysis, and/or with the -b flag, which causes it to read from a saved packet file rather than to read packets from a network interface. In all cases, only packets that match expression will be processed by tcpdump.
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shtumble
shtumble is fairly simple, but does everything I need -- it detects nearby access points, lets you select one, starts DHCP if appropriate (usually), and will do WEP or other custom config for known networks. Access points are colored according to accessibility, interface and connection status are displayed dynamically, and shtumble beeps when new accessible networks come in range.
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Airfinder
Airfinder is a simple Linux program written to help locate a specific wireless MAC address. It helps locating a wireless MAC address or knowing it's presence in the field of antenna. Works in linux only.
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Airpwn
Airpwn is a tool for generic packet injection on an 802.11 network. airpwn requires two 802.11b interfaces, one for listening, and another for injecting. It uses a config file with multiple config sections to respond to specific data packets with arbitrary content.
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WPM Wireless Power Meter
Signal strength meter to analyze a wireless connection and facilitate the setup of point to point links.
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XNetworkStrength
I wrote this because I would often find myself losing signal on my wireless card in my laptop when I was sitting in various places. This shows me what my signal strength is, so that I know what position is a good one to have the laptop in. It's small, and fast, and only uses the X11 API.
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WLANexpert
WLAN Expert is a wireless client utility designed to work with the PRISM chipset by Intersil. The Linksys WPC11 is the only client card I've tested, although many manufacturers use this silicon. Intersil counts Alcatel, Cisco, Compaq, Nokia, Nortel, Samsung and Siemens among its OEMs.
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