Simple Port Forwarding Alternatives

Free open source tool to perform TCP based session relay

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

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

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

TheCodingMonkeys, authors of software like SubEthaEdit.

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

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

Open Source

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

Open Source

pwncat - netcat on steroids with Firewall, IDS/IPS evasion, bind and reverse shell, self-injecting shell and port forwarding magic - and its fully scriptable with Python (PSE)

Reliable TCP and UDP port forwarding for Windows.

This tool is created with the primary intention of making it easy to the end user to set forwarding rules in his router....

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

PortForward's PFConfig Software lets you forward ports on any router for any program.