The X.Org project exists as part of a family of related projects that contribute to the development of the X Window System.

• freedesktop.org
• DRI Wiki useful information about using Direct Rendering with Xorg
• Cairo
• The XFree86 Project, Inc.
• Gnome
• The K Desktop Environment
• Enlightenment
• Linux Terminal Server Project
• Cygwin/X
• Compiz
• Croquet Project
• Project Looking Glass
• The freedesktop.org info page has links to many worthwhile projects.