by FabulaTech, Inc. Serial Port Control is an inexpensive royalty-free component. It supports VB, VB.Net, C#, Borland Delphi, Borland Builder. Just put it on a form and you've got all the functionality you need to access an RS232 port.
by FabulaTech, Inc. Creates virtual COM ports directly from your own programs and fully control them! Provide interaction between serial communications applications and your program! OEM license allows you to distribute this ActiveX control as a part of your software
by ELTIMA Software GmbH Create virtual serial port directly from your application and work with it. Full serial port software emulation. Created virtual serial port looks like real serial port for other Windows applications. Compatible with VB, VC++, C++ Builder and Delphi.