StrongCube SMS Component
- Sends SMS (short message service) from computer connected to mobile phone via serial communication port.
- http://www.strongcube.com/

Virtual Serial Port ActiveX Control
- Allows application to create custom additional virtual serial port in system and fully control it. Created virtual serial ports looks like real serial ports for other Windows applications. [Commercial]
- http://www.mks.zp.ua/vspcontrol.php

Scientific Component PortController
- Simplifies asynchronous, multithreaded RS-232 serial communication tasks in Visual Basic or Visual C++ projects. Includes documentation and 8 example programs (source code also available).
- http://www.scientificcomponent.com/

SuperCom
- A serial data communication toolkit for sockets communication via TCP/IP. [Components, Commercial]
- http://www.adontec.com/super_e.htm

ActivComport
- Support modem or direct serial interface (comport) and can control any device that has a serial interface: printers, modems, network devices, computers, weight indicators. [Component, 30 days shareware]
- http://www.activxperts.com/activcomport/

SuperCom ActiveX
- A communications OLE Custom Control for serial (RS-232,RS-422,RS-485) interfaces. Its downward compatibility with the MSComm custom control makes it very easy to integrate in existing applications. [Control, Commercial]
- http://www.adontec.com/scocx_e.htm

MegaPipe
- The serial line file-transfer ActiveX supporting the protocols of XModem Checksum, XModem CRC, XModem 1K, YModem, YModem-G, Zmodem and Kermit. [Component, 30 days shareware]
- http://www.mw6tech.com/megapipe/megapipe.html

MW6Comm
- A serial communication component (ActiveX and VCL for Delphi & Borland C++). [Component, 30 days shareware]
- http://www.mw6tech.com/comm/comm.html

Sax Comm Objects
- Provides multi-threaded serial communications capabilities. Compatible with MSComm and PDQComm. By Sax Software Corp. [Component/Control, Commercial]
- http://www.sax.net/activex/comm/

RS 422 Controller
- Control for accessing any remote controllable VCR or DDR with Sony protocol RS 422.
- http://www.rs422.com.ar/

I/O ActiveX
- OCX control that provides access to devices on a PCs serial ports and parallel ports. By JSPayne.
- http://www.jspayne.com/io/