AviSynth

BlankClip ()Subtitle ("Hello, world!")

(Creates a video with default properties)

Lingo (Macromedia Director scripting language)

on exitFrame me  put "Hello, World!"  end

Outputs the string to the message window if placed in a single movie frame. Alternatively, to display an alert box stating the message you could use

on exitFrame me  alert "Hello, World!"end

POV-Ray

#include "colors.inc"camera {  location <3, 1, -10>  look_at <3,0,0>}light_source { <500,500,-1000> White }text {  ttf "timrom.ttf" "Hello world!" 1, 0  pigment { White }}