Going through the list, it seems like all of them only work on very specialized subjects and/or are not published. I have read about the DARPA tutor, but I don'

Going through the list, it seems like all of them only work on very specialized subjects and/or are not published. I have read about the DARPA tutor, but I don't think it's been made publically available. So I doubt anyone here has used it, unless they were in that specific branch of the military at the time it was used. I don't see how LLMs deliver on this. I think they could speed up how the curriculum is generated, and I have played around with ChatGPT to do just that, but the questions only need to be generated once. It's the guiding of students through the exercises that needs to be personalized, not the exercises themselves. As for their effectiveness, I am the author of Trane (see my other comment). It's worked pretty well for me, but I am splitting my time between my job, working on the software, creating materials, and actual practice, so I can't really say what the upper limits are until I can focus on just the last part.