Virtual Serial Ports Driver XP 

Using Virtual Serial Ports Driver XP you can create any number of virtual serial ports in your system which will be connected to each other via virtual null-modem cable. You can connect one application to another using virtual serial port pair.
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VSPD Mobile Phone Edition 

VSPD Mobile can create up to 20 pure virtual serial ports in your mobile system, resulting in 10 virtual serial ports pairs available for integration. Both ports in a pair are connected via a virtual null-modem and fully emulate real serial ports.
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Virtual Serial Ports Driver CE 

Virtual Serial Ports Driver for Windows CE creates two pure virtual serial ports in your system which are virtually connected to each other. For other Windows applications they are seen exactly as two real serial ports with null-modem connection.
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Serial Splitter 

Use Serial Splitter to split serial ports at one side into multiple virtual and real serial ports at the other one, as well as join multiple serial ports into one. The unique feature of this version is many-to-many ports splitting/redirection.
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Share Serial Ports 

Share Serial Ports creates virtual serial ports in your system that appear as copies of real ports and allows you to share real serial ports between multiple applications. All applications will be able to receive and send data to serial port.
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Shared Serial Ports 

Shared Serial Port allows you to share real serial ports between multiple applications. All applications will be able to receive data from real serial port simultaneously, as well as send data to it.
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