Emailed the writer, James Warner, and he said he’s “completely unfamiliar with Beagles Bros.”
I remember this quote too, but not the source. Perhaps it’s just zeitgeist. The only time I might have used an Apple ][ was in 1989 on a preschool tour.
Jamis Buck has some interesting slides on Maze generating algorithms.
http://www.jamisbuck.org/presentations/rubyconf2011/
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Another cool example in the realm of game graphics:
And another about procedural dungeon generation
The Tour of Ceylon shows code snippets with a button to test them interactively in a window: the changes can be compiled on the fly to JavaScript and run in the browser.
And there was a page about learning functional programming in JavaScript, where you have (optionally) to solve small problems to read the next session. But it seems to be down, now.
http://visualgo.net/ is another place to experiment and visualize a good number of Data Structure (Equivalent of what they teach at my university).
When I did my original search I covered every possible permutation, abbreviation, pluralization and then eventually synonyms I could think of. Each keyword on its own, manually checking all results. It was a fun challenge… but how about one that is beatable? 
(I still have this massive collection of .dsk files ready for an easy search if there are any new revelations, though I can’t imagine I missed it.)
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Hi Jeff,
Did you take a look at the klipse plugin that brings “code & see” environment to any html page?
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http://immersivemath.com/ila/index.html
The world’s first linear algebra book with fully interactive figures.
What’s the current state of this tutorial? Is the one currently on commonmark.org the winner?
I tested it on my wife and two co-workers. The interactivity is great, but, unfortunately, the questions and exercises could be more carefully worded. My wife was so frustrated with it that she got up from the table and left with only the words (“I can’t”).
The current tutorial fails to put the instructive content (i.e., what syntax to use or the concept of a hard break) side-by-side with the exercise. It also introduces three difficult topics (links, images and code) way too early for non-coding users.
Sure can you open that feedback as issues on GitHub? I am open to re-ordering it if you think there is a friendlier easier order.
and
Great graphics drill-down with many flipbook style image progressions
Another really good one
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Extremely timely example thanks (?) to coronavirus 
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Fantastic interactive synth tutorial!!
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