The Apple Developer Connection has published a new article entitled
Configuring and Running X11 Applications on Mac OS X. A popular graphical user interface (GUI) used on Unix-based operating systems, X11 can also be used on Unix-based Mac OS X. “This means that many existing X11 applications from the UNIX world are available to use for free—but you need to know the ‘secret handshake’ in order to get started,” explained Apple. The new feature explains not only how to set up X11 on the Mac, but also how to download and install open source software that will help you get the most out of it, like OpenOffice and Fink.