Share Serial Ports
Share Serial Ports is an advanced utility, the purpose of which is to share real serial ports between multiple applications in the way, that all applications will receive same data from real serial port simultaneously. Shared Serial Ports can be used for serial port emulation, as it connects... Also, you will be able to set permissions to read, write or change control lines state for every application separately. ... Sharing a serial port is trully effective and reliable with Shared Serial Ports.
http://www.mks.zp.ua/serial_share.exe - 2Mb - Download - Screenshot

Virtual Serial Port Control
If there is a task to provide interaction between communications application and your own program (e. g. serial device emulator), there is no common solution to accomplish it. It is considered that communications applications are intended to work only with hardware serial devices connected to... At the same time Virtual Serial Port Control immediately notifies your application about any actions done by communications application with serial port (port opening/closing, setting DTR/RTS handshake, baud rate setting, XON/XOFF symbols setting, etc).
http://www.virtual-serial-port-con...m/virtual-serial-port-control.zip - 790Kb - Download - Screenshot

Advanced Virtual COM Port
Advanced Virtual COM Port is the first software of its kind which includes both local and network virtual COM port functions. It can share your real COM ports or it can create virtual COM ports and connect them with a virtual null-modem cable locally or through a TCP/IP network or the Internet. ... You can connect to a shared port and use it just like it is on your machine. ... Virtual serial ports created by the program look and work the same way as real ones look and work.
http://www.advancedvirtualcomport.com/files/AdvancedVirtualComPort.zip - 1Mb - Download - Screenshot

Serial Port ActiveXControl
Serial Port AX Control is a powerful ActiveX component that can be used to simplify communication with external devices on rs232 connection. This includes modems, bar code readers, PBX or any other devices that have a serial interface. Serial Port AX Control 2. ... 0 introduces an impressive number of new properties for detailed setting of serial port, numerous new methods and events to control serial port state changes. ... This professional Serial Port component is compatible with Microsoft Windows 95/98/NT/ME/2000 & XP, Microsoft Visual Basic 5-7, Microsoft Visual C++ 5-7,...
http://www.virtualserialport.com/download/serial_activex.exe - 866Kb - Download - Screenshot

DiamondCS Port Explorer
See which ports belong to which programs! Port Explorer shows you all the open ports on your system and what programs own them (called Port to Process mapping). Along with this ability it also has many tools including a packet sniffer, bandwidth throttling and country detection to name just a few. ... Port Explorer also gives the great ability to control these sockets - by allowing the user to spy on any or all sockets owned by a process, and to block sending or receiving of any or all sockets. ... Port Explorer gives you the ability to see all sockets that are open, and shows the state...
http://www.diamondcs.com.au/downloads/pesetup.exe - 1Mb - Download - Screenshot

PHP serial extension
This is a loadable extension for PHP running on Windows implementing serial port handling and communications. Once installed in PHP environment you can programm PHP applications to control serial device hosted on server from remote location; these devices can be anything from video switcher,... There are available functions for opening, closing port, checking port state, reading / writing from / to port, setting control lines.
http://www.easyvitools.com/download/php_ser.zip - 228Kb - Download - Screenshot

Windows Std Serial Comm Lib for PowerBASIC
MarshallSoft serial communication component PowerBASIC library (DLL) for serial port (RS-232. RS-422, RS-485) communications. Features of the Windows Serial Communications Library (WSC4PB) include: Uses the standard Windows API to communicate with any device connected to a serial port. ... Includes 34 functions plus modem control, ANSI emulation, ASCII/XMODEM/YMODEM protocols, hardware and software flow control (XON/XOFF, RTS/CTS, DTR/DSR). ... Is port re-entrant. ... State driven Xmodem and Ymodem on multiple ports simultaneously (up to 256 connections).
ftp://ftp.marshallsoft.com/pub/windows/wsc4pb42.zip - 345Kb - Download - Screenshot

Windows Std Serial Comm Lib for Xbase++
MarshallSoft serial communication component Xbase++ library (DLL) for serial port (RS-232. RS-422, RS-485) communications. Features of the Windows Serial Communications Library (WSC4XB) include: Uses the standard Windows API to communicate with any device connected to a serial port. ... Includes 34 functions plus modem control, ANSI emulation, ASCII/XMODEM/YMODEM protocols, hardware and software flow control (XON/XOFF, RTS/CTS, DTR/DSR). ... Is port re-entrant. ... State driven Xmodem and Ymodem on multiple ports simultaneously (up to 256 connections).
ftp://ftp.marshallsoft.com/pub/windows/wsc4xb42.zip - 327Kb - Download - Screenshot

Windows Std Serial Comm Lib for dBase
MarshallSoft serial communication component Visual dBASE library (DLL) for serial port (RS-232. RS-422, RS-485) communications. Features of the Windows Serial Communications Library (WSC4DB) include: Uses the standard Windows API to communicate with any device connected to a serial port. ... Includes 34 functions plus modem control, ANSI emulation, ASCII/XMODEM/YMODEM protocols, hardware and software flow control (XON/XOFF, RTS/CTS, DTR/DSR). ... Is port re-entrant. ... State driven Xmodem and Ymodem on multiple ports simultaneously (up to 256 connections).
ftp://ftp.marshallsoft.com/pub/windows/wsc4db42.zip - 339Kb - Download - Screenshot

Windows Std Serial Comm Lib for FoxPro
MarshallSoft serial communication component Visual FoxPro library (DLL) for serial port (RS-232. RS-422, RS-485) communications. Features of the Windows Serial Communications Library (WSC4FP) include: Uses the standard Windows API to communicate with any device connected to a serial port. ... Includes 34 functions plus modem control, ANSI emulation, ASCII/XMODEM/YMODEM protocols, hardware and software flow control (XON/XOFF, RTS/CTS, DTR/DSR). ... Is port re-entrant. ... State driven Xmodem and Ymodem on multiple ports simultaneously (up to 256 connections).
ftp://ftp.marshallsoft.com/pub/windows/wsc4fp42.zip - 331Kb - Download - Screenshot