coartoon port

Port Magic is a port scan detector

Use Port Listener as a free lightweight utility to listen on the specified port.

Infinitely port forwarding until the destination is achieved.

Lock your USB port with simple click.

Infinitely port forwarding until the destination is achieved.

The title of this recipe contains the two words that gave the inspiration

Create custom additional virtual serial port in system and fully control it.

Split or join serial ports into one or create complex serial port bundles.

split COM port, open COM port by several applications

Virtual Serial Port Driver allows creating virtual serial port pairs on PC.