Funny, you'd think the idea of a graphical version of BASIC would have come to mind when he bought MacBasic for $1:

https://www.folklore.org/MacBasic.html

For my part, I've decided that my next project will probably be done in PureBasic/SpiderBasic, and that if I then feel the need for pure opensource goodness I'll port it Gambas.

That said, if one wants HyperCard on the Mac (or Windows) there's still LiveCode (though it gave up on opensource).