Wireshark

Wireshark is the world's foremost network protocol analyzer. It lets you capture and interactively browse the traffic running on a computer network. It is the de...

Free Open Source Mac Windows Linux BSD

netcat

Netcat is a featured networking utility which reads and writes data across network connections, using the TCP/IP protocol. It is designed to be a reliable...

Free Open Source Mac Windows Linux

Ethereal

Ethereal® is used by network professionals around the world for troubleshooting, analysis, software and protocol development, and education. It has all of the...

• Discontinued

Free Open Source Windows Linux

tcpflow

tcpflow, a TCP Flow Recorder, is a program that captures data transmitted as part of TCP connections (flows), and stores the data in a way that is convenient for...

Free Open Source Mac Windows Linux

Network Diagnostic Tool

The Network Diagnostic Tool (NDT) is a client/server program that provides network configuration and performance testing to a users desktop or laptop computer. The...

Free Windows Linux Android