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Xcode is a suite of tools, developed by Apple, for developing software for Mac OS X and iOS. Xcode 4, the latest major version, is available on the Mac App Store for $4.99, and on the Apple Developer Connection website for free to registered developers (though membership costs $99 per year). Because version 4 is the first paid version, Xcode version 3 is still available for free download from the Apple Developer Connection website. Mac OS X install DVDs typically include a copy of Xcode, as well.
The main application of the suite is the integrated development environment (IDE), also named Xcode. The Xcode suite also includes most of Apple's developer documentation, and Interface Builder, an application used to construct graphical user interfaces.
The Xcode suite includes a modified version of free software GNU Compiler Collection (GCC, apple-darwin9-gcc-4.2.1 as well as apple-darwin9-gcc-4.0.1, with the former being the default), and supports C, C++, Objective-C, Objective-C++, Java, AppleScript, Python and Ruby source code with a variety of programming models, including but not limited to Cocoa, Carbon, and Java. Third parties have added support for GNU Pascal, Free Pascal, Ada, C#, Perl, Haskell, and D. The Xcode suite uses the GNU Debugger as the back-end for its debugger.