Mac OS X includes a wide variety of open source software from FreeBSD, NetBSD, OpenBSD, the GNU Project, and many more projects each its own vibrant developer community.
Mac OS Forge is dedicated to supporting the developer community surrounding open source components specific to Mac OS X. Here you will find resources for working with the source code to popular Apple-original projects, as well as third party projects that are closely related to the Macintosh operating system.
Only select projects in Mac OS X are featured at Mac OS Forge. Look here for the complete set of open source software found in Mac OS X.