Colasoft Capsa Alternatives

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

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

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

socat is a relay for bidirectional data transfer between two independent data channels.

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

Do you need to map a specific TCP or UDP port on your machine to another port on another machine?

Free open source tool to perform TCP based session relay

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

Packet Sender can send and receive UDP, TCP, and SSL on the ports of your choosing.

Portfwd, Port Forwarding Daemon, stands for port forwarding daemon.

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

TheCodingMonkeys, authors of software like SubEthaEdit.

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