COM Port Stress Test - Allows testing your serial port performance and stability.
Downtown Doug Brown » Parallel Port Tester
Open Port Checker - The simple port forwarding test tool
Test Port Plugs - Blue Ribbon Corp.
Using Test-NetConnection to Test Open Ports | Knowledge Base
5 Ways to Check if a Port Is Opened - wikiHow
Open Port Checker, Port Forwarding Test
How to Test COM Ports and Short Haul Modems
CTP - Instrument test port
LinuxCNC Documentation Wiki: Parallel Port Tester
Open Port Check Tool
Performance Testing - Open Port on Server - Progress Test Studio
Powershell - Testing a Port with Test-NetConnection - Alexandre VIOT
Serial Port Tester
Test Port and Diagnostic Couplings | Parker NA
PortCheck 2.1 - TCP port check Windows 10
Serial port testing
Reliable Open Port Check Tool
USB reliability & benchmarking software - PassMark USB2Test
Simple Port Tester v.3.0.0 | PcWinTech.com™
Test Port Plugs – PIC Gauges
Open Port Scanner - Scan and Test Open Ports | SolarWinds
How to Test COM Ports and Short Haul Modems
