Free Virtual Serial Ports 3.2

As you've probably guessed from its name, this application is meant to help you create virtual serial ports and emulate the behavior of physical serial ports on your system.
Though it's free, Free Virtual Serial Ports is also one of the best tools of its kind, as it's really reliable and accurate, allowing you to emulate a large variety of serial ports, all correctly registered and visible in Windows device manager under standard Ports (COM & LPT) device class, and all behaving exactly like real hardware serial ports, with full serial port functionality.

Free Virtual Serial Ports is a powerful tool that supports custom Plug-and-Play (PnP) serial ports and I/O ports interfaced by 16550 UART, from COM1 to COM255, while providing baud-rate emulation, configuration of data bits, parity (odd, even, mark, space) and stop bits, XON/XOFF software and hardware flow control, etc. You can also use this tool to generate and emulate null-modem cable with DB-25 or DE-9 connectors and Serial (Modem) control lines.

Despite being so feature-rich, setting this tool up and using it is not difficult at all, as its interface is self-explanatory and provides handy hints all along the way.

As you can see, I had plenty of good reasons to say that this app is one of the best of its kind. If you ever need a tool to emulate serial ports and their connections, for whatever purpose, Free Virtual Serial Ports is, simply put, great for the job.