Virtual Serial Port Driver XP4.5
Virtual Serial Ports Driver XP creates two pure virtual serial ports in your system which are virtually connected to each other. For other Windows applications, virtual ports will be seen exactly as two real serial ports connected via null-modem cable. ... With user-friendly GUI and on-the-fly help of Virtual Serial Port Driver XP it's very easy to configure a virtual serial ports pair. ... With virtual ports created by Virtual Serial Port Driver XP you can connect applications to each other and exchange data between them without occupying your real serial ports and using hardware wiring.
http://www.mks.zp.ua/vspdxpd.exe - 1Mb - Download - Screenshot

Virtual Serial Ports Driver CE
Virtual Serial Ports Driver CE creates up to 20 pure virtual serial ports in your mobile system, this results in up to 10 virtual serial ports pairs. Each pair has 2 ports that are virtually connected to each other. For other applications, virtual serial ports will be seen exactly as two real... In this case all data sent by other applications to virtual serial port COM5 (VSP0) will arrive at virtual serial port COM6 (VSP9), and all data sent to virtual serial port COM6 will arrive at virtual serial port COM5 (VSP0).
http://www.eltima.com/download/vspdce.exe - 432Kb - Download - Screenshot

Virtual Serial Port Driver 9x
Virtual Serial Ports Driver (VSPD) is a Windows device driver. Using it you can create two virtual serial COM ports in your system which will be virtually connected to each other. For example, after installing VSPD, you will have Virtual Serial Port COM5 and Virtual Serial Port COM6 added to... These ports will behave like real common serial ports to other Windows applications. ... So, the application, that listening COM5 will get all data, sent by other application to COM6 and vice versa. ... These ports will not interact with any hardware.
http://www.virtualserialport.com/download/vspd2demo.exe - 489Kb - Download

Virtual Serial Port Driver XP4
Virtual Serial Port Driver XP4 creates two pure virtual serial ports in your system which are virtually connected to each other. For other Windows applications, virtual ports will be seen exactly as two real serial ports connected via null-modem cable. ... With Virtual Serial Port Driver XP 4. ... Of course, you can transfer files, other data or do whatever you want as it was real serial ports. ... You can select any port numbers for virtual pair. ... 0 you can connect one application to another using virtual serial ports pair.
http://www.virtualserialport.com/download/vspdxp.exe - 1Mb - Download - Screenshot

Virtual Serial Ports Driver XP2
Virtual Serial Ports Driver (VSPD) is a Windows device driver. Using it you can create any number of virtual serial COM ports in your system which will be virtually connected to each other. For example, after installing VSPD, you will have Virtual Serial Port COM5 and Virtual Serial Port COM6... These ports will behave like real common serial ports to other Windows applications. ... So, the application, that listening COM5 will get all data, sent by other application to COM6 and vise-versa. ... These ports will not interact with any hardware.
http://www.mks.zp.ua/vspdxp.exe - 634Kb - Download - Screenshot

Virtual Serial Ports Driver
Virtual Serial Port Driver by Virtual Serial Port Software, department of Eltima, is a sophisticated software solution aimed to create two pure virtual serial ports virtually connected to each other in your system. Therefore, without additional hardware installation you may use extra serial... Unlike standard physical serial ports, virtual ports can be assigned any number and you can create as many virtual serial port pairs in your system as you want. ... In comparison with a real port a virtual serial port can be easily configured in accordance with your requirements.
http://www.virtualserialport.com/download/vspdxp.exe - 2Mb - Download - Screenshot

Virtual Serial Ports Driver XP
Virtual Serial Ports Driver (VSPD) creates two pure virtual serial ports in your system which are virtually connected to each other. For other Windows applications, virtual ports will be seen exactly as two real serial ports connected via null-modem cable. ... With VSPD you can connect one application to another using virtual serial ports pair. ... Of course, you can transfer files, other data or do whatever you want as it was real serial ports. ... You can select any port numbers for virtual pair.
http://www.eltima.com/download/vspdxp.exe - 1Mb - Download - Screenshot

ITS Net Serial Driver (ITSNSD)
While the operation of different facilities, which are connected to a computer via serial port, there may appear the necessity to start up utility program (for these facilities) not in the machine, to which the facilities connect directly, but in the remote machine, that is connected to the... IP address of the receiving server, port number and the number of the real serial port on the receiver are specified on the client for each port. ... ITSNSD server is a service which realizes the exchange between a real driver of the serial port and TCP/IP.
http://www.itsuperiority.com/downloads/products/avsdnet.zip - 576Kb - Download - Screenshot

HiFlyTechNet Serial Driver (HNSD)
While the operation of different facilities, which are connected to a computer via serial port, there may appear the necessity to start up utility program (for these facilities) not in the machine, to which the facilities connect directly, but in the remote machine, that is connected to the... IP address of the receiving server, port number and the number of the real serial port on the receiver are specified on the client for each port. ... HNSD server is a service which realizes the exchange between a real driver of the serial port and TCP/IP.
http://www.hiflytech.com/downloads/products/avsdnet.zip - 576Kb - Download - Screenshot

Alarit Net Serial Driver (ANSD)
While the operation of different facilities, which are connected to a computer via serial port, there may appear the necessity to start up utility program (for these facilities) not in the machine, to which the facilities connect directly, but in the remote machine, that is connected to the... IP address of the receiving server, port number and the number of the real serial port on the receiver are specified on the client for each port. ... ANSD server is a service which realizes the exchange between a real driver of the serial port and TCP/IP.
http://www.alarit.com/downloads/products/ansd.zip - 283Kb - Download - Screenshot