There were a _lot_ of programs in this space, one of the more interesting was AlphaTap! by Network Improv:
http://networkimprov.net/alphatap/light.html
c.f., the research project:
https://dasher.zone/docs/getting-started/how-to/
For my part, I just write text out using a Wacom stylus on my Note 10+
TY for the flashback: I'd learned Dasher! Jesus-phone had washed that away.
I kind of miss my Compaq iPaq, Danger Hiptop, Handspring Visor ... OK, one of those is not like the others, but it was ideal UX for the time.
>Type by zooming infinitely into a prediction model
Holy crap that's a trippy GIF
I loved the stylus on my Note 10 Lite so much that when the phone was irreparably damaged I replaced it with another identical Note 10 Lite. I'm now on an S24 Ultra and won't consider a new phone without a built-in stylus.