com0com null modem emulator alternative: Virtual Serial Port Driver - YouTube
Steps on how to setup the virtual serial ports on Windows XP and VirtualBox virtual machine
Ubuntu: Setup virtual serial ports (Linux null modem emulator) using tty0tty - YouTube
Null-modem emulator download | SourceForge.net
GitHub - diegopego/com0com-1: Null-modem emulator - The virtual serial port driver for Windows. Brought to you by: vfrolov [Vyacheslav Frolov](http://sourceforge.net/u/vfrolov/profile/)
WiSnap WiFi connection to PC using COM-TCP Redirector - Serialio
Installing Com0Com Null Modem Emulator (an alternate to vCom)
Null-modem Emulator (com0com) screenshot and download at SnapFiles.com
Virtual Null Modem
RS232 null modem pinout and wiring - DEV Community 👩💻👨💻