Mac OS Forge dedicated to projects focused on Mac OS X.
Mac OS Forge, a new community development site hosted by Apple, was recently launched to support Web Kit and other open source projects focused on Mac OS X. In addition, developers can create and browse third-party open source projects that are closely related to the Macintosh operating system. Current projects on Mac OS Forge include source code to the new iCal Server in Leopard Server, and Apache-licensed versions of Bonjour service discovery and Launchd process management.
While select projects in Mac OS X are featured on Mac OS Forge, a complete set of open source software within Mac OS X can be found by visiting the Apple Developer Connection.
Taken form the Apple Developer Connection newsletter