ViperCard is super cool! I've been obsessed with HyperCard since 1990, and have been thinking of creating a HyperCardy-like program for my own uses for several months now. In fact, I ordered a bunch of books on HyperCard and HyperTalk just this afternoon, before seeing the ViperCard post on Hacker News.
Another set of programs I find very interesting are the "constructor" sets from the 1980s, such as Pinball Construction Set and Racing Destruction Set:
https://en.wikipedia.org/wiki/Pinball_Construction_Set
https://www.youtube.com/watch?v=Cc1EHDbun3U
https://en.wikipedia.org/wiki/Racing_Destruction_Set
THINK Pascal for the Mac was another incredible program from the 1980s. It's still the most user-friendly and responsive-feeling IDE I've ever used:
I have been wanting to build Free Software for several projects that capture the feel of these tools. If you would be interested in more details, I can start a separate thread, or perhaps we could do a Google Hangout or Skype call.
Cheers,
--Will
I would love to see iPad support as soon as possible.