Sniffer Technologies
Network monitoring, analysis, reporting and capacity planning tools.
http://www.sniffer.com/

Vector CANtech, Inc.
Controller area network(CAN) analysis can tools (CANalyzer, CANoe, CANcardX) and training, integration, source code services.
http://www.vector-cantech.com/

Amoeba Telecom
Provides a suite of convergence traffic analysis tools for telecom, Internet, and mobile Internet protocols. Company and product information, white paper, and FAQ.
http://www.amoebatel.com

Broadframe Corp.
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.
http://www.broadframe.com/

datacomsystems.com
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.
http://www.datacomsystems.com/

Frontline Test Equipment
The leader in affordable, PC-based serial, Ethernet, Bluetooth, Industrial Automation, and SCADA data communication protocol analyzers and test equipment.
http://www.fte.com

Logix Communications
Developers of network analysis tools for WAN, LAN and InterNetworking specializing in protocol analyzers and traffic monitors. Includes description of products, technical information, and evaluation copies for download.
http://www.logixcomms.co.uk/

Pulse website home page
Pulse is a worldwide provider and distributor of Data Communications, WAN, Computer Networking Equipment, Signaling Conversion and Wireless solutions.
http://www.pulsewan.com/

TrafMeter
IP traffic accounting and Network monitoring software for small to medium size LANs. Product information, online documentation, FAQ, and 30 day trial.
http://www.lastbit.com/trafmeter/

Protocol-analyzers.com
SCSI and Fibre channel protocol analyzers, test equipment and diagnostic software.
http://www.protocol-analyzers.com

Sniff'em | Next Generation Packet Sniffer
Sniff'em a promicious Packet Sniffer. A next-generation network protocol analyzer or sniffer, Sniff'em allows the network administrator to capture and retrace the steps of any network user with never before seen ease.
http://www.sniff-em.com/

CommView Packet Monitor
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.
http://www.tamos.com/products/commview/

APS Linux Packet Sniffer
Free packet sniffer for linux, written in C. Compiles under Slackware, Debian GNU-Linux, TurboLinux 4.x.x and most SuSE/RedHat versions.
http://www.swrtec.de/clinux/

EtherDetect - Connection-oriented Packet Sniffer
Protocol analyzer to monitor, capture and analyze network packets. This sniffer provides a view for TCP connections and UDP threads.
http://www.etherdetect.com

Packetyzer
Captures packets on network, shows data of application layer together, and provides TCP flow view.
http://www.packetyzer.com/

Ettercap
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.
http://ettercap.sourceforge.net/

EffeTech HTTP Sniffer
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.
http://www.effetech.com/sniffer/

ATM Analyzer as PCI card
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.
http://www.chipweb.de/knoll/diploma/

Wireshark Network Protocol Analyzer
Network protocol analyzer for Windows and Unix that allows examination of data from a live network, or from a capture file on disk.
http://www.wireshark.org/