[MutantSushi]

It's not MacRuby, it's RubyCocoa, but yes, they have their own project using a language not included in this list. No, I'm not expecting consistency here against their own "baby", but what kind of environment does this set up? Would you even want to use RubyCocoa in this environment, much less a 3rd party language bridge to Cocoa (which is 100% targetting Apple's platform and APIs).

[base10]

MacRuby and RubyCocoa are two separate projects. MacRuby is not a Cocoa bridge like RubyCocoa is. It's a complete reimplementation of Ruby's primitives in Objective C to allow you to compile a Ruby app to a double-clickable app bundle.