A public wiki that covers MacOsx programming topics, such as ObjectiveCee and Cocoa (formerly NextStep).
The CocoaDev site was transferred to a new owner, who switched it to MediaWiki and disallowed anonymous contributions. That hasn't prevented most of the current activity on the site from being spam and reversions. Due to formatting differences, many of the code examples are unreadable. And I've noticed that the reversions are happening less frequently. A sad end to a once-essential resource.
2014-05-13: CocoaDev is now implemented using GitHub as a backend, but the content is still all 10 years old.
See also: CocoaProgrammers