I think OCaml is still missing:
print_endline "Hello World!";;
Two GUI versions: The first one with the built in Graphics module:
Graphics.open_graph " 80x20";;
Graphics.moveto 5 5;;
Graphics.draw_string "Hello World";;
read_line ()
And one with Tk:
open Tk
let top = openTk ()
let l = Label.create top ~text:"Hello World";;
pack [l]
let _ = Printexc.print mainLoop ()