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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.
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2D Graphics Release Notes for Mac OS X v10.5 (HTML)
Describes the changes and issues related to Core Image and Quartz 2D in Mac OS X v10.5.
Graphics & Imaging 2008-04-08
AppleScript Studio Release Notes (HTML)
Describes late-breaking news and highlights of new or changed features in the latest release of AppleScript Studio.
Tools 2007-10-31
Application Kit Reference Update (HTML) (PDF)
Summarizes the symbols added to the Application Kit framework.
General 2007-07-18
Application Kit Release Notes (10.4 and Earlier) (HTML)
Design Guidelines 2006-07-17
Application Kit Release Notes (10.5) (HTML)
New document that describes new features, notes, and known issues for the Application Kit Framework on Mac OS X v10.5.
Design Guidelines 2007-10-31
Automator Reference Update (HTML) (PDF)
Summarizes the symbols added to the Automtor framework.
Apple Applications, Scripting & Automation 2007-07-25
Automator Release Notes (HTML)
Updated for changes in Mac OS X version 10.5.
Apple Applications, Tools 2007-10-31
Code Signing Release Notes (HTML)
Security 2007-10-31
Core Animation Release Notes (HTML)
Describes features, issues, and workarounds related to Mac OS X v10.5 and its support of Core Animation.
Graphics & Imaging 2007-05-31
Core Data Reference Update (HTML) (PDF)
Summarizes the symbols added to the Core Data framework.
General 2007-07-18
Core Data Release Notes (HTML)
Describes features, issues, and workarounds related to Mac OS X v10.5 and its support of Core Data.
Data Management, General 2007-12-11
DiscRecording Release Notes (HTML)
Updated for Mac OS X v10.5
File Management, User Experience 2007-10-31
Foundation Reference Update (HTML) (PDF)
Summarizes the symbols added to the Foundation framework.
General 2007-07-18
Foundation Release Notes (HTML)
Describes new features, notes, and known issues for the Foundation framework in Mac OS X v10.5.
Design Guidelines, Scripting & Automation 2007-10-31
Foundation Release Notes (10.4 and earlier) (HTML)
Release notes for older versions of Mac OS X.
General 2009-01-06
Garbage Collection Release Notes (HTML)
Describes features, issues, and workarounds related to Mac OS X v10.5 and its support of garbage collection.
Objective-C Language 2007-10-31
Input Method Kit Reference Update (HTML) (PDF)
Summarizes the symbols added to the Input Method Kit framework.
Internationalization, Text & Fonts 2007-07-18
Input Method Kit Release Note (HTML)
Describes an Objective-C framework for building input methods for Chinese, Japanese, and other languages.
Internationalization, Text & Fonts 2007-07-17
Instant Message Reference Update (HTML) (PDF)
Summarizes the symbols added to the Instant Message framework.
Apple Applications 2007-07-18
Launch Services Release Notes (HTML)
Interapplication Communication 2007-10-31
Objective-C Release Notes (HTML)
Updated for Mac OS X v10.5
Objective-C Language 2007-10-31
Preference Panes Reference Update (HTML) (PDF)
Summarizes the symbols added to the Preference Panes framework.
User Experience 2007-07-18
QTKit Reference Update (HTML) (PDF)
Summarizes the symbols added to the QuickTime Kit framework.
QuickTime 2007-07-18
Resolution Independent UI Release Notes (HTML)
Graphics & Imaging 2005-04-29
Scripting Bridge Release Note (HTML)
A release note that describes the classes and techniques used to control scriptable applications from Objective-C code.
Scripting & Automation 2007-10-31
SearchKit Release Notes (HTML)
User Experience 2005-04-29
Security Reference Update (HTML) (PDF)
Summarizes the symbols added to the Security framework.
Security 2007-07-18
Sync Services Release Notes (10.4) (HTML)
Apple Applications, Data Management, Internet & Web, Syncing 2005-04-29
Sync Services Reference Update (HTML) (PDF)
Summarizes the symbols added to the Sync Services framework.
Syncing 2007-07-18
Sync Services Release Notes (10.5) (HTML)
Describes new features, notes, and known issues for Sync Services on Mac OS X v10.5.
Apple Applications, Data Management, Syncing 2007-10-31
WebKit Reference Update (HTML) (PDF)
Summarizes the symbols added to the WebKit framework.
Internet & Web 2008-11-19