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 via virtual null-modem cable
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MarshallSoft GPS Component for Visual Basic 

GPS component VB library toolkit reads and decodes standard GPS NMEA 183 sentences from the RS232 serial port, as well as computes great circle distances and bearings. Runs as a background thread unattended. Works with Visual Basic and VB.NET.
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MarshallSoft GPS Component for C/C++ 

GPS component C/C++ library toolkit reads and decodes standard GPS NMEA 183 sentences from the RS232 serial port, and computes great circle distances and bearings. Runs as a background thread unattended. Works with C++,VC.NET,C#,MFC,C++ Builder.
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AlarIT Virtual Serial Driver (AVSD) 

AVSD is appointed for emulation of one, two or more (up to 200) serial streams. Hardware devices are not necessary. This product is based on Windows XP DDK and doesn't require using devices of other manufacturers.
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AVSD 

AVSD is appointed for emulation of one, two or more (up to 200) serial streams. Hardware devices are not necessary. This product is based on Windows XP DDK and doesn't require using devices of other manufacturers.
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Multicom 

Multicom is appointed for emulation of one, two or more serial streams. Hardware devices are not necessary. This product is based on Windows XP DDK and doesn't require using devices of other manufacturers.
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