XQuartz is an open source project which aims to continue support for X11 in Leopard.
Although parts of the libraries and applications necessary for X11 now ship with Mac OS X, the official version provided by Apple does not take into account the latest developments of X.org. Note that to install XQuartz, you must first update OS X to version 10.5.2. If you did not install X11 when you installed OS X, you can use your OS X installation DVD to install it.
XQuartz is an essential addition for any Mac user that wants to maintain support for X11 on their Mac. strong>
Download XQuartz 2.6.1 in Softonic