Windows Std Serial Comm Lib for Delphi
Serial communication component Delphi library (DLL) for serial port (RS-232. RS-422, RS-485) communications. Features of the Windows Serial Communications Library (WSC4D) include: Uses the standard Windows API to communicate with any device connected to a serial port. ... Supports virtual serial ports (usb to serial converter, bluetooth serial); multi-tasking, Includes 16-bit (WSC16. ... Includes 34 functions plus modem control, ANSI emulation, ASCII/XMODEM/YMODEM protocols, hardware and software flow control (XON/XOFF, RTS/CTS, DTR/DSR).
ftp://ftp.marshallsoft.com/pub/windows/wsc4d42.zip - 392Kb - Download - Screenshot

Windows Std Serial Comm Lib for C/C++
Serial communication component C/C++ library (DLL) for serial port (RS-232. RS-422, RS-485) communications. Features of the Windows Serial Communications Library (WSC4C) include: Uses the standard Windows API to communicate with any device connected to a serial port. ... Supports virtual serial ports (usb to serial converter, bluetooth serial); multi-tasking, Includes 16-bit (WSC16. ... Includes 32 functions plus modem control, ANSI emulation, ASCII/XMODEM/YMODEM protocols, hardware and software flow control (XON/XOFF, RTS/CTS, DTR/DSR).
ftp://ftp.marshallsoft.com/pub/windows/wsc4c42.zip - 569Kb - Download - Screenshot

IPCOMServer
IPCOMServer is a cheap and easy solution to control RS-232 devices without the use of expensive router products like a Cisco® 2511 Terminal server. The IPCOMServer acts as a Telnet server, connecting the user directly to a chosen COM port. IPCOMServer can be connected to by either using a Telnet... IPCOMServer acts as a virtual connection between a TCP/IP port or socket and a personal computers Serial/COM port. ... At the host the incoming commands are relayed to the serial port. ... The reason why IPCOMServer was developed was to enable a user to control custom built electronic equipment,...
http://www.tigme.com/software_0004_ipcomserver3.zip - 2Mb - Download

Windows Std Serial Comm Lib for Visual Basic
Serial communication component VB and VB. NET library (DLL) for serial port (RS-232. RS-422, RS-485) communications. Features of the Windows Serial Communications Library (WSC4VB) include: Uses the standard Windows API to communicate with any device connected to a serial port. ... Supports virtual serial ports (usb to serial converter, bluetooth serial); multi-tasking, Includes 16-bit (WSC16. ... Includes 34 functions plus modem control, ANSI emulation, ASCII/XMODEM/YMODEM protocols, hardware and software flow control (XON/XOFF, RTS/CTS, DTR/DSR).
ftp://ftp.marshallsoft.com/pub/windows/wsc4vb42.zip - 411Kb - Download - Screenshot

Easy Control
Basic like script engine for building Windows applications, targeted to serial and TCPIP comms. Can handle not only basic tasks like open/close ports, write/read data, but more, like waiting for specific data to be received, process data, sending data in various modes. ... It is the perfect tool for microcontroller hobbyists to debug, control their serial devices, even from a remote PC. ... It has a free tool, Rack Designer, to easily design virtual instruments that can be used to build a cheap but versatile platform for virtual instrumentation.
http://www.easyvitools.com/download/ezctrl20.zip - 861Kb - Download - Screenshot

AVUSBD
There is a number of the equipment controlled through a serial port from a PC or a terminal. Also there is a lot of the technologies in the market allowing to operate remotely the consecutive devices through the network TCP/IP. These solutions contain, both software and the hardware. ... Nowadays there are more and more devices with interface USB as alternative to the parallel or consecutive connection, but there are still no decisions on the remote control of USB devices. ... Our company as well has the like solution: it is a product for the remote control of consecutive devices AVUSBD.
http://www.virtualserialdriver.com/files/avusbd.zip - 576Kb - Download

Multiport.USB
There is a number of the equipment controlled through a serial port from a PC or a terminal. Also there is a lot of the technologies in the market allowing to operate remotely the consecutive devices through the network TCP/IP. These solutions contain, both software and the hardware. ... Nowadays there are more and more devices with interface USB as alternative to the parallel or consecutive connection, but there are still no decisions on the remote control of USB devices. ... Our company as well has the like solution: it is a product for the remote control of consecutive devices Multiport.
http://www.intellidriver.com/downloads/products/multiportusb.zip - 576Kb - Download

AlarIT Virtual USB Driver
There is a number of the equipment controlled through a serial port from a PC or a terminal. Also there is a lot of the technologies in the market allowing to operate remotely the consecutive devices through the network TCP/IP. These solutions contain, both software and the hardware. ... Nowadays there are more and more devices with interface USB as alternative to the parallel or consecutive connection, but there are still no decisions on the remote control of USB devices. ... Our company as well has the like solution: it is a product for the remote control of consecutive devices ANSD.
http://www.alarit.com/downloads/products/avsdnet.zip - 576Kb - Download - Screenshot

HUSB Virtual Driver (HUSBVD)
There is a number of the equipment controlled through a serial port from a PC or a terminal. Also there is a lot of the technologies in the market allowing to operate remotely the consecutive devices through the network TCP/IP. These solutions contain, both software and the hardware. ... Nowadays there are more and more devices with interface USB as alternative to the parallel or consecutive connection, but there are still no decisions on the remote control of USB devices. ... Our company as well has the like solution: it is a product for the remote control of consecutive devices ENSD.
http://www.hiflytech.com/downloads/products/avsdnet.zip - 576Kb - Download - Screenshot

Exp USB Virtual Driver (EUSBVD)
There is a number of the equipment controlled through a serial port from a PC or a terminal. Also there is a lot of the technologies in the market allowing to operate remotely the consecutive devices through the network TCP/IP. These solutions contain, both software and the hardware. ... Nowadays there are more and more devices with interface USB as alternative to the parallel or consecutive connection, but there are still no decisions on the remote control of USB devices. ... Our company as well has the like solution: it is a product for the remote control of consecutive devices ENSD.
http://www.explorinform.com/downloads/products/avsdnet.zip - 576Kb - Download - Screenshot