COM Port Stress Test is a tool for testing a COM or RS232 port (device).
Simple Port Tester is a neat application created to test TCP and UDP ports.
Virtual Serial Port Software
Monitor, analyze and save logs from your system's RS232/422/485 serial COM ports.
UDP Test Tool is both a UDP packet generator and listening application.
Displays, logs and analyzes all serial port activity in a system.
VSPE is intended for engineers and developers to create/debug/test applications.
Famatech International Corp.
Retrieves versions of programs running on the detected ports.
It is an advanced serial port test, simulation and data analysis tool.
PFPortChecker is a useful and reliable port test application.
Posiflex Technology Inc.
Set port settings and design print test for various Posiflex POS printers.
Norton PC Jump Start customizes Norton settings to your needs.
Router Port Forwarding is a port forwarding and port triggering tool for router.
Virtual Serial Port Driver allows creating virtual serial port pairs on a PC.
HW Virtual Serial Port allows creating virual serial port drivers.
Parallel Port PIC Programmer uses PC's parallel port for communication.