Wireshark

"One of Wireshark's greatest strengths, Combs says, is that it runs on just about any platform. "You can run it on Windows, Mac OS, Linux, Solaris...it runs everywhere," he says. "And you have a GUI and a command line version—and you can get about 90 percent of the same information from each. The GUI has a few more things, but the actual packet detail and information is the same."

"The amount of detail available, Combs says, is another key asset. "The ability to follow a TCP stream was added several years ago, and we were about the only one at the time that supported that," he says. "You can just right-click on a TCP packet, and it shows you all the information going back and forth between the client and the server."

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