I think HyperCard was special in that other people's stacks were easy to come by, and easy to disassemble. There was no compiled distributable form, all stacks

I think HyperCard was special in that other people's stacks were easy to come by, and easy to disassemble. There was no compiled distributable form, all stacks could be cracked open if you wanted to see how they ticked, and just modified just as easily if you wanted to see how the program's behavior would change.