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]
amComm
Provides asynchronous serial data communications for application, either directly using the PC serial Comm ports, or in combination with amTapi to provide serial data communication over a modem.
I/O ActiveX
OCX control that provides access to devices on a PCs serial ports and parallel ports. By JSPayne.
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]
MW6Comm
A serial communication component (ActiveX and VCL for Delphi & Borland C++). [Component, 30 days shareware]
RS 422 Controller
Control for accessing any remote controllable VCR or DDR with Sony protocol RS 422.
Sax Comm Objects
Provides multi-threaded serial communications capabilities. Compatible with MSComm and PDQComm. By Sax Software Corp. [Component/Control, Commercial]
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).
StrongCube SMS Component
Sends SMS (short message service) from computer connected to mobile phone via serial communication port.
SuperCom
A serial data communication toolkit for sockets communication via TCP/IP. [Components, Commercial]
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]
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]