TCP Terminal is a tool for testing and debugging TCP communication.
bore is a simple CLI tool for making tunnels to localhost
Yet Another Terminal :: Serial Communication :: Engineer/Test/Debug
Scriptable data terminal which supports several interfaces.
A cross platform debugger for serial port/Bluetooth/TCP/UDP
Serial <-> TCP/IP, Serial <-> UDP/IP, TCP/IP <-> UDP/IP
The virtual serial port driver for Windows.
MU Terminal
Serial and TCP terminal for engineering and debugging
Forward RS232 via TCP/IP
A collection of network-oriented tools
ISeeWhatYouAreDoing - a tool for remote acces with very! low bandwith.
Protocol simulator