High Quality Content by WIKIPEDIA articles! RubyCocoa is a Mac OS X framework that provides a bridge between the Ruby and the Objective-C programming languages, allowing the user to manipulate Objective-C objects from Ruby, and vice-versa. It makes it possible to write a Cocoa application completely in Ruby as well as to write an application that mixes Ruby and Objective-C code. As of 2008, an Apple project called MacRuby is under development to replace RubyCocoa.