The Apple Lossless Audio Codec (ALAC) is an audio codec developed by Apple which reduces the size of audio files with no loss of information.
The Calendar and Contacts Server project is a standards-compliant server implementing the CalDAV and CardDAV protocols.
CUPS is the standards-based, open source printing system developed by Apple for macOS and other UNIX-like operating systems.
Darwinbuild is a collection of tools that assist compilation of the many projects contained in Darwin, the open source base of macOS.
Darwin Streaming Server (DSS) allows you to send streaming media to clients across the Internet using the industry standard RTP and RTSP protocols.
DCE/RPC is an implementation of the Remote Procedure Call technology developed by the Open Group as part of the Distributed Computing Environment.
The Filesystem Tools project (FS Tools) is where the Apple filesystem teams publish tools used to test the filesystems in macOS.
Grand Central Dispatch (GCD or libdispatch) provides comprehensive support for concurrent code execution on multicore hardware.
The MacPorts package management system makes it easy to install, upgrade and uninstall software on your Mac.
MacRuby is an implementation of Ruby 1.9 on top of the Objective-C runtime and garbage collector, the LLVM compiler infrastructure and the Foundation and ICU frameworks.
SCAP on Apple provides authoritative information, tools and support for the Security Content Automation Protocol community on Apple platforms.
The components of the Smart Card Services project provide the necessary abstraction layer and integration of smart cards into Apple's CDSA implementation.
WebKit is the web browser engine used by Safari, App Store, and many other macOS, iOS, and Linux applications.
ValidateMP4 validates and analyzes MP4 (MPEG-4 Part 14) media files.
The XQuartz project is an open source effort to develop a version of the X.Org X Window System that runs on macOS.
macOS includes a wide variety of open source software from FreeBSD, NetBSD, OpenBSD, the GNU Project, and many more projects, each with its own vibrant developer community. Only select macOS projects were hosted at macOS forge. For the complete set of open source software found in macOS, visit Apple Open Source.