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GitHub has some old software-on-cassette already. The best part is you don't need a cassette player to use it, just connect the headphone jack of your cellphone (if the manufacturer wasn't courageous enough to remove it) to the casette-in port of your favorite 8-bit machine and hit play on the WAV file from GitHub.

https://github.com/sonic2000gr/TI99

You can build a device to do this yourself over a serial port.

https://maker.pro/pcb/projects/make-uart-cassette-tape-inter...

I do this with an old TRS-80 and a digital voice recorder. I just made up a cable to hook them up.

I had the cassette drive for my C64, and I remember just how amazingly long it took to load and save even the most trivial things.

As a youngster, I did not enjoy aligning the cassette tape drive heads.

If you still have a working Acorn Electron or BBC Micro computer you can load software into it directly from a web page using only an audio cable with PlayUEF:

https://www.8bitkick.cc/playuef.html