Wireshark:
is a network packet analyzer. A network packet analyzer will try to capture network packets and tries to display that packet data as detailed as possible.Wireshark can capture traffic from many different network media types – and despite its name – including wireless LAN as well. Which media types are supported, depends on many things like the operating system you are using

Download Link : https://www.wireshark.org/download.html

Capsa:
is the name for a family of packet analyzer developed by Colasoft for network administrators to monitor, troubleshoot and analyze wired & wireless networks. Currently, there are three editions available: Capsa Enterprise Edition, Capsa Professional Edition, and Capsa Free .
Freeware Network Analyzer (Packet Sniffer) for students, teachers, computer geeks and other non-commercial purposes.

Download Link : http://www.colasoft.com/download/pro...capsa_free.php

NetworkMiner:
is a Network Forensic Analysis Tool (NFAT) for Windows (but also works in Linux / Mac OS X / FreeBSD). NetworkMiner can be used as a passive network sniffer/packet capturing tool in order to detect operating systems, sessions, hostnames, open ports etc. without putting any traffic on the network. NetworkMiner can also parse PCAP files for off-line analysis and to regenerate/reassemble transmitted files and certificates from PCAP files.
NetworkMiner is a Network Forensic Analysis Tool (NFAT) for Windows that can detect the OS, hostname and open ports of network hosts through packet sniffing or by parsing a PCAP file. NetworkMiner can also extract transmitted files from network traffic.

Download Link : http://sourceforge.net/projects/netw...atest/download

SharpPcap:
is a cross-platform packet capture framework for the .NET environment, based on the famous pcap / WinPcap libraries. It provides an API for capturing, injecting, analyzing and building packets using any .NET language such as C# and VB.NET.

Download Link : http://sourceforge.net/projects/shar...atest/download

PacketSquare (CapEdit):
is a free and open-source pcap-based network protocol testing tool.[1] It is used for testing network devices (IDS/IPS, firewall, routers switches etc.,), networktroubleshooting, analysis, software and communications protocol development, and education.

A GUI PCAP Based Network Protocol Testing Tool.
Download link : https://code.google.com/p/packetsqua...downloads/list