High Quality Content by WIKIPEDIA articles! Cocoa is one of Apple Inc.'s native object-oriented application program environments for the Mac OS X operating system. It is one of five major APIs available for Mac OS X; the others are Carbon, POSIX, X11 and Java. Cocoa applications are typically developed using the development tools provided by Apple, specifically Xcode and Interface Builder, using the Objective-C language. However, the Cocoa programming environment can be accessed using other tools, such as Clozure CL, LispWorks, Object Pascal, Python, Perl and Ruby, with the aid of bridging mechanisms such as PasCocoa, PyObjC, CamelBones and RubyCocoa. An implementation of the Ruby language, called MacRuby, which does away with the requirement for a bridging mechanism, is under development by Apple, while Nu is a Lisp-like language which can be used with Cocoa without a bridge. It is also possible to write Objective-C Cocoa programs in a simple text editor and build it manually with GCC or GNUstep's makefile scripts.