I always thought HyperCard was very cool, and was sorry I didn't get a chance to play with it at the time.
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25 years of HyperCard—the missing link to the Web | Ars Technica
Before the World Wide Web did anything, HyperCard did everything.
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I always thought its cardfile model for screens and data, with hyperlinks holding it together, was both elegant and simple to understand. Good stuff.
I remember reading a hypercard version of "David's Sling". (http://preview.tinyurl.com/7qpt869) Neat stuff.
HyperCard was one of the all-time great pieces of software. I used it a lot, and I still miss it.