Xquartz
The Xquartz project is an open-source effort to develop a version of the X.org X Window System that runs on Mac OS X. Together with supporting libraries and applications, it forms the X11.app that Apple has shipped with OS X since version 10.5. Latest Release 2009.01.03 X11.pkg version 2.3.2.1 released Wireshark and others working with this version 🙂