You know what's actually the product I've met with the most similarity to HyperCard? Microsoft PowerPoint. You have cards, buttons that can navigate between them in arbitrary ways, effects that can trigger on loading or unloading a card, etc. And for everything else, you have VBA, which, like AppleScript, allows buttons and fields to do arbitrary things (with generic COM objects, even!) I once wrote a full-scale Dragon-Quest-style CRPG in PowerPoint, using the cards as a scene graph; it was actually quite friendly.
There's some truth to this (as appalling as the notion is). While I'm teaching Python to my 7th grade nephew his school is having him 'program' in Powerpoint. As dismissive as I am of the notion, it does allow students to quickly get some stuff up on the screen and start being interactive.
Fortunately my nephew has taken to Python and is even starting to become a language snob "That looks like a stupid way to program".
Hmm... putting PowerPoint and Python side-by-side reminds me a little of Shoes (http://shoesrb.com/), which is also something that "allow[s] students to quickly get some stuff up on the screen and start being interactive", but is purely code-based, rather than having any sort of GUI interface construction tool.
