You can even get smart Rubik's Cubes now! It pairs with bluetooth, and of course there's a corresponding app that gives you feedback.
https://youtu.be/ez8x5JDLexU?t=390
What other toys could we add computers to?
miniblog.
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Apparently there's a separate linux kernel flavour (beyond the usual vanilla, LTS, hardened) just for personal computers! https://liquorix.net/
Looks like it's developed on GitHub and tuned for interactive usage.
It's hard to get developers to pay for tools. I think the problem is that computers are incredibly general machines.
Once you've worked in programming for a while, it's easy to imagine making a whole range of tools. It's hard to guess the complexity of new domains though.
A (slightly dramatic) history of Engelbert's vision for knowledge tools, his prototypes on early timesharing systems, and the transition to personal computers: