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Leopard Guides
Apple provides APIs, file format specifications, and other resources to provide developers with opportunities to interact with and extend various Apple applications.

A guided introduction to writing code that interacts with Apple applications.   Essential information for developers integrating their code with Apple's applications.   C and Objective-C API references organized by framework.
Apple Applications Topics
Software for maintaining an address book of contacts.   A postproduction application for professional photographers.   An application for automating repetitive computing procedures.

An application for displaying and managing desktop utilities, called widgets.   Software for video editing, compositing, and real-time effects.   A personal calendar application that can be shared online.

An instant messaging application that permits video and audio conferences.   An application that lets users import, edit, and publish digital photos.   An application that synchronizes data on a Macintosh computer with external devices.

The cinema-quality presentation software for Mac OS X.   Apple's full-featured email client with an integrated address book.   Software for creating, editing, and rendering advanced motion graphics.

A word processing and layout application.   A development tool for creating motion graphics compositions.   An application for playing and interacting with QuickTime multimedia.

The advanced web browser for computer desktops and iPhone.   An enterprise-class storage area network file system.