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Leopard Release Notes
Cocoa is an object-oriented application environment designed for developing Mac OS X native applications. The Cocoa frameworks support rapid development and high productivity. Cocoa provides developers starting new Mac OS X projects the fastest way to full-featured implementations. Applications from other platforms can also be brought to Mac OS X quickly using Cocoa.
A guided introduction and learning path for developers new to Cocoa.   Essential information for developers using Objective-C.   Objective-C API references organized by framework.
Cocoa Topics
View the complete Cocoa Release Notes List.
Apple Applications
Facilities in Cocoa for interacting with and extending Apple applications. 		 
Data Management
Object-oriented interfaces for representing and manipulating data. 		 
Design Guidelines
Policies and design patterns for creating Cocoa programs.
File Management
Object-oriented interfaces for gaining access to files and folders on storage devices. 		 
Graphics & Imaging
Object-oriented APIs for creating graphics content in Cocoa applications. 		 
Interapplication Communication
Facilities for data sharing and communication between Cocoa programs.
Internationalization
Object-oriented APIs that ready applications for other locales. 		 
Internet & Web
Object-oriented APIs for developing web content and Internet and web applications. 		 
Objective-C Language
A programming language designed for sophisticated object-oriented programming.
QuickTime
Classes for creating and playing multimedia in Cocoa applications. 		 
Scripting & Automation
Object-oriented APIs for creating scriptable applications and Automator actions. 		 
Security
Authentication, authorization, and cryptographic services for Cocoa applications.
Syncing
Object-oriented APIs for syncing a Cocoa application's data with external devices. 		 
Text & Fonts
Object-oriented APIs for working with strings and fonts, and rendering glyphs. 		 
Tools
A suite of tools for building Cocoa applications, frameworks, and more.
User Experience
Object-oriented APIs for creating the look and feel of Cocoa applications. 		   
View legacy documents, including technologies, features, products, APIs, and programming techniques that are no longer supported or have been superseded.