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Wireshark is the world's foremost network protocol analyzer. It lets you capture and interactively browse the traffic running on a computer network. tcpdump is a common packet analyzer that runs under the command line.
An advanced network monitoring solution to monitor network up/downtime, traffic and usage. Features include availability, performance, and bandwidth monitoring (SNMP, WMI, packet sniffing, NetFlow), instant alerts, reporting, failover clustering. SmartSniff is a packet sniffer that capture TCP/IP packets and display them as sequence of conversations between clients and servers. NetworkMiner is a Network Forensic Analysis Tool (NFAT) for Windows. NetworkMiner can parse PCAP files and regenerate/reassemble transmitted files and certificates from PCAP files with HTTP, FTP, SMB, SMB2, TFTP and several other protocols. Acrylic WiFi Free v2.2 for Windows is an advanced Wi-Fi scanner that is able to gather real-time WLAN information and perform network analysis. Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system. PCAPdroid is an android app to capture the phone traffic and analyze it remotely (e.g. via Wireshark). The traffic can be easily downloaded from a remote device thanks to the integrated HTTP server, or streamed to a remote UDP receiver. Driftnet is a program which listens to network traffic and picks out images from TCP streams it observes. Packetyzer provides a Windows user interface for the Ethereal packet capture and dissection library. Log all traffic on your network card. Analyze and parse network packets. Capture transmitted files and passwords. Native Cocoa app for capturing and analyzing packets. Similar to Wireshark, but with a native interface (and less features). arpwatch is a computer software tool for monitoring Address Resolution Protocol traffic on a computer network. Kismon is GUI client for kismet (wireless scanner/sniffer/monitor) with several features:* a live map of the networks* file import: netxml (kismet), csv (old kismet version)... USBlyzer is a USB Protocol Analyzer and USB Traffic Sniffer for Windows that displays USB Descriptors, captures and analyzes USB Devices activity in real time.