Rawr: JRuby application packaging tool

Rawr, a packaging and deployment tool, is all you'll ever need for your JRuby projects. With Rawr, a simple, pre-generated configuration file turns your code into an executable jar, a .exe for Windows, and a .app for OS X.

It's kinda like Shoes in that it gives you an exe for Windows, an app for OS X, and a jar that you can use everywhere else. Cool stuff.