wSHDCOM is a program for debugging serial communications.
It give you posibility to send data via serial line and receive it.
All of this data are displayed as live hex dump view. And this is not all!
Using possibility to listen two com port in the same time you can actually spy serial communications using same cable you use with ViewComm but in this case for free :).
You also have posibility to spy communication of some other program which run on same PC as wSHDCOM and communicate with some remote hardware using no cable at all.