An open-source kernel-mode virtual serial port driver (requires manual driver signing workarounds on newer Windows versions).
Most "keygen" executables are wrappers for Trojans that can steal your data. vspe registration key
A highly popular, open-source driver that allows you to create unlimited virtual COM port pairs. It is free for 64-bit Windows, though installing it may require enabling test mode or finding a community-signed version due to driver signature enforcement. vspe registration key
: Issued to a company for a specific number of seats/computers. vspe registration key