http://www.X.org/ — Home page of the X.Org Foundation, which produces the X11R6.8 release of the X Window System. The X11R6.8 release is bundled with Red Hat Enterprise Linux to control the necessary hardware and provide a GUI environment.

http://xorg.freedesktop.org/ — Home page of the XR116.8 release, which provides binaries and documention for the X Window System.

http://dri.sourceforge.net/ — Home page of the DRI (Direct Rendering Infrastructure) project. The DRI is the core hardware 3D acceleration component of X.

http://www.gnome.org/ — Home of the GNOME project.

http://www.kde.org/ — Home of the KDE desktop environment.

http://nexp.cs.pdx.edu/fontconfig/ — Home of the Fontconfig font subsystem for X.