Wireshark is one of the most popular and Open Source Packet Analyzers. It is used for network troubleshooting and analysis. The program’s original name was Ethereal. You can download Wireshark, below.
https://www.wireshark.org/download.html
Capsa Free is a network analyzer and a free network tool. It provide monitoring, troubleshooting,analysis etc. It is free version of Capsa Network Analyzer and a special edition for students, teachers and junior network engineers to learn network protocols. Youn can download Capsa free, below.
http://www.colasoft.com/capsa-free/
Solarwinds Network Bandwidth Analyzer Pack is a useful network application that monitors your network performance and sniffes your traffic. You can download Solarwinds Network Bandwidth Analyzer Pack, below.
https://www.solarwinds.com/network-bandwidth-analyzer-pack
Fiddler is a web debugging tool that analyze the traffic between any computer and the internet. It is used to test the performance. You can download Fiddler, here.
https://www.telerik.com/fiddler
Ntop, is a network monitoring and analyze tool. It has a user friendly GUI. You can download Ntop, here.
https://www.ntop.org
Tcpdump is one of the open source Packet Analyzers that runs under the command line. It allows the user to display TCP/IP and other packets being transmitted or received over a network to which the computer is attached. You can download Tcpdump , below.
http://www.tcpdump.org
WinDump is the command line network analyzer for Windows. It is similar to tcpdump. But tcpdump is for Unix, WinDump is for Windows.You can download WinDump, below.
https://www.winpcap.org/windump/
NetworkMiner is one of the Packet Analyzers that captures packets and parses the data to extract files and images. This helps you to reconstruct events that a user has taken on the network. You can download Network Miner, below.
https://www.netresec.com/
Kismet is a network tool that sniffs and analyzes the network traffic of hidden networks SSIDs. It is used for wireless networks. You can download Kismet, below.
https://www.kismetwireless.net
EtherApe is an open source and free tool for Packet Analyze. It is similar to Wireshark but it has more graphical views.You can download EtherApe, below.
http://etherape.sourceforge.net
Cain and Abel is a good Network Sniffer but it has also more ability than this. It is also a password recovery mechanism for windows platforms and it is used on Windows platforms. You can also perform dictionary attacks to retrieve lost credentials, analyze routing etc. You can download Cain and Abel, below.
http://www.oxid.it/cain.html
KisMAC is a network sniffer used in MAC platforms. It is similar to Kismet. More than Kismet, it provide several mapping and de-auth features. You can download KisMAC, below.
https://kismac.en.softonic.com/mac
NetStumbler is a network tool that is used for “wardriving”. It is based on Windows. NetStumbler is more obstrusive tha Kismet that is a little passive sniffer. You can download NetStumbler, below.
http://www.netstumbler.com/downloads/
Ngrep is one of the useful Network Packet Analyzers that is used for grep functions as its name implies. It searches TCP, UDP, ICMP or other protocol matches. You can download Ngrep, below.
https://sourceforge.net/projects/ngrep/