Last I heard, HN itself runs on Arc. From what I can see, Bel is more a kind of art project than a language for writing other things in. PG evidently has some

Last I heard, HN itself runs on Arc. From what I can see, Bel is more a kind of art project than a language for writing other things in. PG evidently has some ideas about what the most timeless, eternal version of Lisp would look like. Both languages are sketches of the Platonic Lisp he has in his head.