along those lines, the entire notion of a web playground (a sandbox where users can just write and execute or otherwise process code) has vastly reduced the barrier for checking out a project or experimenting with its behaviour

> web playground

This _so_ much. Where in the past I've used Jupyter Notebooks for short, one off stuff or to test something, I now do that online for almost any language.

Notebooks are still useful to write documentation though.

Well, Notebooks main use case is a different purpose, not for trying one-off stuff or checking if some syntax is valid. It's for doing stuff step by step, annotating the steps and/or explaining each result.

Web playgrounds are ok for testing some syntax (if you don't have a local REPL/easy way to test), but not for one-off stuff that involves file input or that you want to check against real environment assets.

> Well, Notebooks main use case is a different purpose, not for trying one-off stuff or checking if some syntax is valid.

I know, but that's what I had used it for too. Like posting some code, for example in a HN post ;) As I've said, I still use it mainly for documentation.

I was thinking about including Mathematica as enlightenmentware. Mathematica 6 (https://www.wolfram.com/mathematica/newin6/) was the first truly interactive system I used (we happen to have a box with a license at the university). It impressed me so much that I still have a lot of warm fuzzy feelings toward Stephen Wolfram and his work.

Unfortunately, my relationship with Mathematica didn’t go anywhere: It was too expensive back then, and I never found a good use for it except for double-checking my homework.

I tried other computer algebra systems, but they didn’t impress me as much.

If you own a Mathematica license and found a good application for it, please let me know!

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I would dare say for me the https://pythontutor.com/ even more so than compiler Explorer. (hint: it's not just for python)

> (hint: it's not just for python)

I would definitely have overlooked it, and it really needs a better domain name.

Pahole is a related utility for high performance programmers. I've been able to attain orders-of-magnitude performance improvements in trading applications using it.