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Leopard Articles
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.   An application for automating repetitive computing procedures.   An application for displaying and managing desktop utilities, called widgets.

A personal calendar application that can be shared online.   An application that synchronizes data on a Macintosh computer with external devices.   A development tool for creating motion graphics compositions.

The advanced web browser for computer desktops and iPhone.