beat port

Perform scans on predefined port ranges.

Locked USB port is a lightweight application that serves to lock on computer.

Utility for monitoring and setting the individual bits of the Parallel port

Using the COM Port in VB.NET

This program allows you to view and control parallel port on hardware level.

Free Serial Port Monitor, RS232 Com Software Sniffer

Scan ports on your Windows PC.

An efficient COM/RS232 stress-testing tool for software/hardware developers

It enables printing on up to 64 local and/or network printers at the same time

HW VSP is a software tool, which adds to the operating system serial.