Xcode's a suite of tools for developing software on Mac OS X, developed by Apple. Xcode 3.0, the latest major version,'s bundled free with Mac OS X v10.5, though it isn't installed by default. Version 3.0 isn't supported on older Mac OS versions, for which Xcode's also available free from Apple Developer Connection. The main application of the suite's the integrated development environment (IDE), also named Xcode. The Xcode suite also includes most of Apple's developer documentation, and Interf… (More on Xcode)