What's the coolest JAVA application program you've seen?

What's the coolest JAVA application program you've seen, comemrcial or non-commercial?
You can post more than one. :p

public class Hello {
   public static void main(String[] args) {
      System.out.println("Hello, " + (args.length == 0 ? "World" : args[0]) + "!");
}

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