Xcode is Apple's suite of tools for developing software on Mac OS X. Xcode 3.0, the latest major version, is bundled free with Mac OS X v10.5, though isn't installed by default. Version 3.0 isn't supported on older Mac OS versions, for which Xcode is also available for free from Apple Developer Connection. 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 Build… (More on Xcode)