Apps similar to Shared Serial Ports - HHD include Null-modem emulator, which is free and open source. Other options are Shared Serial Ports. Between them they cover Windows.
The Null-modem emulator (com0com) is a kernel-mode virtual serial port driver for Windows. You can create an unlimited number of virtual COM port pairs and use any pair to connect one COM port based application to another.
Shared Serial Ports is an advanced utility, the purpose of which is to share real serial ports between multiple applications in the way, that all applications will receive same data from real serial port simultaneously.
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