Leopard Reference Library
User Experience Frameworks lists reference documents for the frameworks located in the System/Library/Frameworks folder that are most relevant to developers implementing the visual appearance, interactive behavior, and assistive capabilities of Mac OS X application software.

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Application Kit Framework Reference (HTML) (PDF)
Describes the interface for all things related to an application's user interface.
2008-11-19
Force Feedback Framework Reference (HTML)
Describes the public interfaces to the Force Feedback implementation in Mac OS X, including support for plug-ins.
2008-04-08
Application Services Framework Reference (HTML) (PDF)
Describes the API for a number of services--such as Quartz 2D and ATSUI--that are essential to Carbon applications.
2007-10-31
Carbon Framework Reference (HTML) (PDF)
Describes many fundamental user experience APIs used in Carbon applications.
2007-10-31
Core Services Framework Reference (HTML) (PDF)
Describes the API for many fundamental operating system services.
2007-10-31
Quick Look Framework Reference (HTML) (PDF)
Describes the interface for creating plug-ins that generate Quick Look previews and thumbnails.
2007-04-13