TCPDump

Wireshark is the world's foremost network protocol analyzer, and is the de facto (and often de jure)...

Try out namebench. It hunts down the fastest DNS servers available for your computer...

Packet Peeper is a network protocol analyzer (or "packet sniffer"). Its features include TCP stream reassembly...

Airtool is a system menu-bar application that provides basic functions to check...

PacketStream provides point-and-click activation of the Mac's built-in network monitoring program...

MacSniffer is a graphical user interface for the built-in "tcpdump". This is a packet sniffer that comes with all Macs...

Etherdump Lite is an app that analyzes network captures. It imports and graphically displays packet captures...

FrameSeer is an inexpensive network packet capture application for the Apple...

VisualSniff is a handy application which helps you visualize network...

NetDumper is a Mac OS X network packet sniffer that dumps all packets to a file. This application...

AquaEthereal is an application launcher, written in Python...

Libpcap is a free and open-source library for network monitoring. The tool offers a system...

SharkLauncher (formerly AquaEthereal) is a free, open-source application...

tnv (The Network Visualizer or Time-based Network Visualizer) depicts network...