Same for free C#-based Xamarin, but this is based on Visual Studio. LiveCode comes to my mind as well which is close to HyperCard/Flash, but needs programming

Same for free C#-based Xamarin, but this is based on Visual Studio. LiveCode comes to my mind as well which is close to HyperCard/Flash, but needs programming for any interactivity... How about an iBook if this is for Apple? IBook Author is free and allows for interactive elements like quizzes and embedded HTML pages. Pretty nifty, free, but only for iOS again.