Ethereal
by Gerald Combs, <gerald (at) ethereal (dot) com [email concealed]>
Platforms: AIX, FreeBSD, HP-UX, IRIX, Linux, NetBSD, OpenBSD, SCO, Solaris, True64 UNIX
Categories: Sniffers
Version: v0.10.3
URL: http://www.ethereal.com/
Ethereal is a network protocol analyzer, or "packet sniffer", that lets you capture and interactively browse the contents of network frames. The goal of the project is to create a commercial-quality packet analyzer for Unix, and the most useful packet analyzer on any platform.