Free - HHD Software

Free software serial port monitor, Com Rs232 sniffer with communication packet data analyzer. This monitoring utility can spy, capture, view, analyze, test com ports activity performing com port connection and traffic analysis
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$19.00 - Intellidriver Inc.

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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Free - Eterlogic Software

VSPE is intended to help software engineers and developers to create/ debug/ test applications that use serial ports. It is able to create various virtual devices to transmit/ receive data, share physical serial port data for several apps, and so on.
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$39.99 - Zyl Soft

ZylGPSSimulator is a Delphi GPS receiver simulator component. It creates a virtual serial port, converts the position parameters in NMEA format and writes them to the virtual port. The user can set parameters like latitude, longitude, altitude...
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