Packetyzer Alternatives

Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.

Open Source

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

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SmartSniff is a packet sniffer that capture TCP/IP packets and display them as sequence of conversations between clients and servers.

Packet Peeper is a free network protocol analyzer (packet sniffer) for Mac OS X.

NetworkMiner is a Network Forensic Analysis Tool (NFAT) for Windows.

Intercepter-NG is a multifunctional network toolkit for various types of IT specialists.

Official source of information about Netstumbler.

Netcat is a featured networking utility which reads and writes data across network connections...

Open Source

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.

Ettercap is a suite for man in the middle attacks on LAN.

Ethereal® is used by network professionals around the world for troubleshooting, analysis...

inSSIDer Essential makes it easy to maintain small business WiFi.

Wifi Analyzer is a handy tool which helps you to select a better channel for your wireless router.