Up to this point, we’ve spent quite a bit of time buried in the weeds with user tools. To a large extent, we’ve ignored the fact that, aside from providing beautiful and functional user applications, Mac OS X is also a powerful development platform. Not only is Mac OS X loaded with the native Apple developer tools, including Xcode, but it’s also very extensible using open source tools, such as Python, Perl, and PHP. A developer can create Cocoa applications native to Mac OS X, or use the Apple IDE to create tools that leverage the open source underpinnings of Mac OS X. It’s also possible to add frameworks to the system that further extend the connections between these open source technologies and the native Apple development tools.
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