$39.99 - Mu-Consulting

Records all data received on a serial port to a file on a disk. It was originally designed to record telephone traffic data from a corporate phone system (PBX) for later analysis. However, it is generic enough for any one-way serial traffic.
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$29.95 - Haxxio

Replace serial (RS232, RS485) cables with ethernet network, using UDP. Most uses for the Redirector are based on one of replacing a simple serial cable, or connecting serial devices over WiFi links, or enabling groups op PCs to communicate together.
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$99.95 - ELTIMA GmbH

Virtual Serial Port ActiveX CE is a powerful advanced ActiveX Control for Embedded platforms that allows your software to create custom additional virtual serial ports in Windows CE system and fully control them from within your own program.
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$23.00 - Cosmin Buhu

Basic like script engine for building Windows applications, targeted to serial and TCPIP comms. Very versatile and easy to use, it is a cheap but powerful platform for virtual instrumentation or general purpose developing.
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