Interact and extend various Apple applications through their APIs, file format specifications, and other resources. Look here for resources related to Apple applications shipped or sold separately from Mac OS X.
Note that Mac OS X includes a number of built-in applications, including Automator, Address Book, iCal, Mail, and others. The APIs and programming resources for these applications are documented elsewhere in this reference library. Web and web content developers will find relevant information about Safari in the Safari Reference Library.