Free packet sniffer for linux, written in C. Compiles under Slackware, Debian GNU-Linux, TurboLinux 4.x.x and most SuSE/RedHat versions.

ATM Analyzer as PCI card to be used in cheaply available PCs. Any Linux or Windows PC can be used for monitoring and testing purposes on ATM networks. The board and device driver design was done by Thomas Knoll in the course of his Diploma thesis.

Broadframe Corporation delivers network-level broadband tools for cost-effective development, test, and demonstration of broadband products, including DSL protocol analyzers and DSL network simulators.

A program for monitoring network activity capable of capturing and analyzing packets on an Ethernet network or dial-up connection. This sniffer can run on any Windows 95/98/Me/NT/2000 system.

Increased network visibility through Matrix switches for Fiber, ATM, Gigabit, 100BaseFx, Ethernet and Token Ring technologies partnered with Network Associates Sniffer Technology. The best in analytical switching solutions.

Provide a HTTP protocol network sniffer, packet analyzer and file rebuilder. It is dedicated to capture IP packets containing HTTP protocol, rebuild and save the HTTP communications and files sent through HTTP protocol.

Protocol analyzer to monitor, capture and analyze network packets. This sniffer provides a view for TCP connections and UDP threads.

Ettercap is a multipurpose sniffer/interceptor/logger for switched LAN. It supports active and passive dissection of many protocols (even ciphered ones) and includes many feature for network and host analysis.

The leader in affordable, PC-based serial, Ethernet, Bluetooth, Industrial Automation, and SCADA data communication protocol analyzers and test equipment.

Provides test and measurement solutions for computer I/O, storage and networking protocols, enhancing productivity and time to market.