Packet Peeper!

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 facto (and often de jure) standard across many industries and educational institutions.

SmartSniff is a packet sniffer that capture TCP/IP packets and display them as sequence of conversations between clients and servers. You can view the TCP/IP conversations in Ascii mode (for text-based protocols, like HTTP, SMTP, POP3 and FTP) or as hex dump (for non-text base protocols, like DNS). Application can capture TCP/IP packets on your network without installing a capture driver (works only for Windows 2000/XP or greater).

Packetyzer provides a Windows user interface for the Ethereal packet capture and dissection library. Ethereal is used by network professionals around the world for troubleshooting, analysis, software and protocol development, and education. Ethereal has all of the standard features expected in a protocol analyzer, and several features not otherwise available.

Debookee is the simplest & most powerful network traffic analyzer for macOS.

LANGuardian is the first and only deep packet inspection (DPI) software to provide SMB network managers with root cause information about network and user activity. LANGuardian gives a deeper level of detail than standard flow tools, and is an affordable alternative to premium appliance based DPI tools.

Pirni Pro is a network security tool designed for iOS, and specifically for iPhone and iPod Touch devices. It is capable of intercepting traffic on a wireless network segment, capturing passwords, and regular expressions entered by the user.The core system of Pirni, written in C, is open-source software, and licensed under the GNU General Public License. Pirni Pro is the succeeding version of Pirni, and is commercial software, available in the Cydia Store, for jailbroken Apple devices.FeaturesPirni Pro supports active dissection of all non-ciphered protocols (given that the user has supplied a regular expression for dissection). The application description contains the following: ARP spoof the entire network or any target Watch a live feed over interesting packets collected Manage regular expressions to filter out data, such as site credentials In addition, the software also offers the following features: Password collectors for: HTTPExternal links Root at Everything official website Cydia Link Extensive Tutorial »

Native Cocoa app for capturing and analyzing packets. Similar to Wireshark, but with a native interface (and less features). If you don't like the X11 GTK Wireshark, this is your app.

AirSnare monitors network traffic for unfriendly MAC addresses and alerts you when a MAC address is found that isn't on the friendly list. AirSnare also monitor DHCP requests from clients.

Packetsdump is a free sniffer tool, it is also a general purpose network diagnostic tool for LAN administrators, security professionals, programmers and students who are interested in network traffic transmitted between PC and the whole LAN. There are some typical uses of Packetsdump: