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Leopard Release Notes
A full suite of free developer tools is available to Mac OS X developers, who can speed up their development process by using these tools to prototype, compile, debug, and optimize their software products. Xcode, Apple's integrated development environment, can be used with Cocoa, Carbon, or Java. Apple also provides a wide selection of open source tools, such as GCC.
A guided introduction for developers new to Mac OS X developer tools.   Essential information for developers using the Xcode software development tool set.  
Tools Topics
View the complete Tools Release Notes List.
Compiling & Debugging
Tools and techniques for code generation and debugging. 		 
Darwin
Open source developer tools such as GCC and GDB. 		 
Dashcode
Apple's IDE for developing iPhone web applications and Dashboard widgets.
Interface Builder
An application for designing user interfaces and connecting actions to code. 		 
Performance
Resources for measuring, evaluating, and improving code performance. 		 
Scripting & Automation
A mechanism for performing operations and controlling applications using scripts.
WebObjects
Tools for creating and deploying web applications using WebObjects. 		 
Xcode
Apple's IDE for developing applications, libraries, plug-ins, and more. 		 
View legacy documents, including technologies, features, products, APIs, and programming techniques that are no longer supported or have been superseded.