Awesome WM is mainly written in Lua and uses it as its configuration file format
Cheat Engine, memory editor/debugger uses Lua to be embedded in its "cheat tables"
Conky, a Linux system monitor, uses Lua for advanced graphics
CRYENGINE, game engine, uses Lua for user scripts
Garry's Mod uses Lua.
"use strict"console.log("Hello world!");
module Main wheremain :: IO ()main = putStrLn "Hello, World!"
puts "Hello world!"