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Specifically for text QR, there's `qr` from:

https://github.com/lincolnloop/python-qrcode

In Archlinux, it's in the python-qrcode package.

There're other command line utilities to make PNG QRs, like `qrencode`.

qrencode also has a -t argument which accepts a utf8 value. Great way for quickly opening URLs you have in your clipboard on mobile devices during development as you can pipe in your clipboard to qrencode.

Also https://github.com/gtanner/qrcode-terminal (nodejs) Generates code with ascii block characters. Can be use as a library or a a terminal command

Both libqrencode and qrcode-terminal are capable of using ANSI escape codes for colored text to produce black and whites squares. Two space characters make about the right aspect ratio in an xterm window. I reinvented the same method myself a while ago, so it's funny how different people come up with the same idea. Haven't tried it on a VT100 terminal yet, but it should probably work there too.

https://fukuchi.org/works/qrencode/

This works great, and I very much prefer generating my QR codes locally than on any website.

I used this to get QR codes implemented in a legacy print system. Worked great. It's also in Homebrew.

curl qrenco.de/yessir