Tuffcode Limited produces HTTP Scoop, an HTML traffic analyzer/packet sniffer that makes it easy for developers and others to easily analyze client-server communication and diagnose scripts and web applications by observing the actual traffic running between the web browser and web server.
HTTP Scoop provides functionality similar to the network analysis tools included with Interarchy, but it is specifically dedicated to monitoring HTTP traffic (rather than all TCP/IP traffic), and includes specialized features (such as HTML and XML syntax highlighting) that are in tune with this philosophy. For example, while command line tools such as tcpflow, tcpdump, and ethereal perform similar functions, these tools do not fully decode all of the traffic that HTTP can deliver (such as GZIP content encoding).
Version 1.4.3 adds/changes the following:
The demonstration version provides a fully-functional 14-day trial of the software.
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Finally, take a look at ALEMIA if you think you know that name of an application, but aren't quite sure.
For an interesting and objective third-party view of Apple's networking technology - from MacTCP through Open Transport and beywond - Peter Sichel's Sustainable Softworks page is unparalleled.
These are applications that are newer and of potential interest, but which I haven't yet selected for permanent inclusion. Have a look, and let me know if you think they deserve to be part of the permanent collection!