Apple provides tools and programming interfaces to help move code to Mac OS X, where developers can take advantage of advanced features such as the Aqua user interface, the Quartz graphics system, and Rendezvous networking.
Low-level porting information related to Darwin (the open source foundation of Mac OS X, based on 4.4BSD UNIX).
View legacy technologies, including technologies, features, products, APIs, and programming techniques that are no longer supported or have been superseded.