Virtual Serial Port Driver allows creating virtual serial port pairs on a PC.
Simple Port Forwarding works with WebPages and not directly with your router.
Serial Port Software
Serial Port Splitter grants simultaneous access to a COM port from several apps.
Active Ports monitors all open TCP and UDP ports on a local computer.
Displays, logs and analyzes all serial port activity in a system.
Router Port Forwarding is a port forwarding and port triggering tool for router.
HW Virtual Serial Port allows creating virual serial port drivers.
Parallel Port PIC Programmer uses PC's parallel port for communication.
COM Port Data Emulator is a tool for emulating a com port or an Ethernet device.
COM Port Stress Test is a tool for testing a COM or RS232 port (device).
1st Net Scanner is a useful IP Finder and Port Finder. It builds IP finder, port finder, IP scanner...
The vnar performs measurements on one port or two port networks.
ELTIMA Software GmbH
COM Port Redirector enables data redirection from one rs232 port to another.
Lalim Parallel Port Control can control hardware through the parallel port.