### The XeTeX project

XeTeX (by Jonathan Kew) is a successor to the shareware TeX/GX program. It is a Unicode-based (UTF-8) TeX implementation which is able to make use of Mac OS X AAT (Apple Advanced Typography) `.dfonts` and OpenType fonts. It uses Apple’s Quartz system (which facilitates the afore-mentioned font access) to generate PDF output.

A Linux version has been announced (2006); that version of course can’t use AAT fonts, and relies on OpenType fonts alone.

The project has a web site for the user who wants more than this simple answer, and you can also sign up to a mailing list.

This question on the Web: http://www.tex.ac.uk/cgi-bin/texfaq2html?label=xetex