Open Port Check Tool
PortCheck 2.1 - TCP port check Windows 10
Serial Com Tester
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Serial Port Tester
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COM Port Stress Test - Allows testing your serial port performance and stability.
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ConfigMgr Client TCP Port Tester
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Simple Port Tester v.3.0.0 | PcWinTech.com™
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COM Port Stress Test Download: Test the behavior of COM, RS232, and RS485 ports by simulating heavy activity with the help of this program aimed at software and hardware developers
PortCheck 2.1 - TCP port check Windows 10
Test Port Heavy Duty: CEVaC DA6205
