ntop is a free, open source network traffic probe that shows the network usage, similar to what the popular "top" command in UNIX. ntop is based on libpcap. ntop comes with two applications:
ntop users can use a a web browser to navigate through ntop (which acts as a web server) traffic information and get a dump of the network status. In the latter case, ntop can be seen as a simple RMON-like agent with an embedded web interface. The use of a web interface; limited configuration and administration via the web interface; and reduced CPU and memory usage make ntop easy to use and suitable for monitoring various kind of networks.
Version 4.0 - the latest source code release of the software - adds/changes the following:
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Also, if you have an older Mac, be sure to check out the "Classic" applications page for more options.
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!