Commy, a barebones serial monitor (ala minicom, screen, miniterm.py).
Tested on Mac and Linux, might have a go at Windows if I can figure it out.
I normally use GNU Screen for monitoring serial connections, but it’s a poor fit and I don’t like telling non-technical people on Macs about how to workaround screen’s oddness (how to exit, detached state, etc).
Commy is a big improvement because it says in the top corner how to exit.
Builds on the great work of GitHub - ZigEmbeddedGroup/serial: Serial port configuration library for Zig