HyperNext doesn't appear to be actively developed; the most recent updates I see are from last year, and it can't be used on modern computers. Decker's most recent release was yesterday morning.
There's a fair amount of usage of it on Itch.io, if you are into that indie crowd. I was skeptical of it at first -- the whole 1-bit dithering aesthetic seems a bit too retro-twee, but I find it it is the best Hypercard-alike in terms of functionality -- it "just works" as compared to most Hyperclones that seem more like a proof of concept than a functional program.
Unlike LiveCode (or so far as I am aware HyperNext), Decker is free and open-source: https://github.com/JohnEarnest/Decker
HyperNext doesn't appear to be actively developed; the most recent updates I see are from last year, and it can't be used on modern computers. Decker's most recent release was yesterday morning.
I'd be happy to go into more detail if you like.