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I am currently searching for implementations of Huet's Zipper ``in the wild''.

So far, I have found:

Are there other ways to implement//other implementations of the zipper?

N. Brett
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    The stated close reason is "Questions asking us to recommend or find a book, tool, software library, tutorial or other off-site resource are off-topic for Stack Overflow as they tend to attract opinionated answers and spam." -- I don't see how this applies here. The question asks about a particular [data structure](https://en.wikipedia.org/wiki/Zipper_(data_structure)), and its applications in software. This is neither a request for recommendation, nor is it the kind of question that's likely to attract spam. (This may well be not a great fit, but the stated closure reason does not apply.) – ShreevatsaR May 16 '18 at 21:41
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    @ShreevatsaR "Or other off site resource". The main point is that there's no definitive way to "answer" the question. It's a request for an annotated list of things, not an answerable problem. – Cubic May 17 '18 at 11:47
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    @Cubic That may well be a valid reason to close the question, but it is *not* the reason currently given. (Also, the question does not ask for *recommendations* (which tend to attract opinionated answers) as you also seem to agree—it asks for examples.) – ShreevatsaR May 17 '18 at 13:51
  • @ShreevatsaR Examples are an "off site resource" in the same vein as books, tools or tutorials. – Cubic May 17 '18 at 15:23
  • I've had trouble with people on S.O. closing questions that are very on-topic to programming and very narrow requests. The gist of the balk seems to be: questions that request open-ended lists as the answer are forbidden no matter how well worded, no matter how hardcore on-topic, no matter how precisely worded, no matter how narrow in scope, no matter how not-an-opinion-at-all. The critiques demand that a question evoke a single answer, not an open ended list of factual answers. – Andreas ZUERCHER Jun 02 '21 at 16:11
  • As a single answer to the now-closed question, an open-source implementation of Huet's zipper is at http://stanch.github.io/zipper which might also give insight which apps utilize this library productively. OP is a valid question that should be allowed on S.O. and here in this comment I have provided a valid answer as well. – Andreas ZUERCHER Jun 02 '21 at 16:21

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