Quartz A version of the X.Org X Window System that runs on OS X The XQuartz project is an open-source effort to develop a version of the X.Org X Window System that runs on OS X. Together with supporting libraries and applications, it forms the X11.app that Apple has shipped with OS X since version 10.5. Download Version Released Info XQuartz-2.7.6.dmg 2.7.6 2014-05-17 For OS X 10.6 or later (including Mavericks) X11-2.6.3.dmg 2.6.3 2011-07-20 For OS X 10.5.x (final Leopard release) A list of all available XQuartz releases can be found here . (Development “beta” releases, if available, are here .) OS X Software Updates have included some of the work done by the XQuartz project, but for various reasons, Apple cannot ship the latest and greatest version offered by the XQuartz site. Since the XQuartz X11 package clobbers Apple's X11.app, their software update ...