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I know it's filesystems and not code, but the SGI Irix "fsn" file system navigator, featured in Jurassic Park, seems worth mentioning:

It's in the OP

It is now. It was not when I posted the comment. The last bullet point there was "Primitive", so the author has added a few.

Whoops sorry about that, added a note to make it clearer. Thanks for the suggestion!