We all know that Objective-C is the primary language for writing apps for the Mac, but it's not the only language with first-class Cocoa development status — Ruby and Python also share that distinction. Each of these three Cocoa languages have their own distinct strengths and weaknesses to be exploited, along with a rich set of libraries from outside of the Mac world, waiting to be harnessed by Cocoa.  This talk develops the skills you need to integrate a second language into your Objective-C codebase; we'll begin by discussing the differences between the three Cocoa languages, and identifying cases where your task may be better-suited to Python or Ruby; this is followed by integrating external Python/Ruby libraries into Cocoa, frying ducks, and developing original Python or Ruby code to accompany your Objective-C codebase.  We'll also touch on juggling the different coding standards that Python and Ruby languages prefer in a single project.