Ethereal 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.

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

tcpdump is a common packet analyzer that runs under the command line.

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.

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

Capsa Enterprise, a strong intelligent network traffic analysis & monitoring software, can quickly pinpoint network problems in real time & improve network performance.

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

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

Simple Port Forwarding works with WebPages and not directly with your router.

Free open source tool to perform TCP based session relay

TcpLogView is a simple utility that monitors the opened TCP connections on your system, and adds a new log line every time that a TCP connection is opened or closed.

TheCodingMonkeys, authors of software like SubEthaEdit.