Using Virtual Serial Ports Driver XP you can create any number of virtual serial ports in your system which will be connected to each other via virtual null-modem cable. You can connect one application to another using virtual serial port pair.
Use Serial Splitter to split serial ports at one side into multiple virtual and real serial ports at the other one, as well as join multiple serial ports into one. The unique feature of this version is many-to-many ports splitting/redirection.
Software serial port monitor Rs232 sniffer with protocol analyzer and packet data logger. This monitoring utility can spy, capture, view, log, analyze test com ports activity performing com port connection and traffic analysis with data acquisition