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.
gps nmea serial component library visual basic vb.net gps toolkit vb control dotnet toolkit usb bluetooth

NCD Device Development Lib 

NCD relay controllers allow computer controlled switching from the RS232 serial port of a microcontroller or computer.NCD video switchers allow computer controlled multiplexing of audio or vide signals from the RS232 serial port of your computer.
relay control controller device driver com port serial port e3c video switcher a/d

SerialIP Utilities 

SerialIP Utilities is easy-to-use package to resolve a problem of remote access to equipment and log all data received from this equipment into files to analyse them in the future. SerialIP Utilities is a software based RS232 to TCP/IP converter.
serial tcp serial to tcp rs232 to tcp converter serial logging tcp logging

ser232mon 

ser232mon can monitor the RS232 COM1,2,3,... and show the datas when the Windows application control the RS232 COM port,such as modem mini-ATS, projector etc.
ser 232 monitor serial port

EzCom2Web 

Lightweight HTTP server and a script engine (like PHP or ASP) in one application . It is a very good tool to control a device connected on a remote PC serial port with a web browser. You can build a complete web interface for your RS232 device.
web server communication serial php asp port remote

CommLog for CE 

CommLog of 5dtool is a freeware used for record and monitor the data from serial port of PocketPC. It would be useful for record data from total station, GPS and other rs232 device connected to PDA.
com port rs 232 rs 232 simulation emulator serial port commlog 5d tool 5dtool pda pocket pc