Automatic Software for XTensions
   Offers standard and custom Macintosh programs specialising in applications and extensios for Quark XPress. Profile, product range and services with downloadable demonstration versions and purchasing information.
   http://www.automatic.com/

Badia Software
   A Toronto-based developer of XTensions for QuarkXPress including FullColor, Printools, FullMeasure, Duplica, FaxReady, Vistas.
   http://www.badiaxt.com/

Extensis QX-Tools
   A set of eight productivity tools for QuarkXPress. Import Microsoft Word tables, Excel charts, Illustrator artwork, FreeHand drawings, PDF files. Includes utilities for precisely resizing groups of objects, creating and working with layers, searching and
   http://www.extensis.com/qxtools/

Quark Tutorials
   Provides a series of QuarkXPress tutorials as well as step-by step instructions outlining how to make a technical manual suitable either for print or for screen display.
   http://www.sketchpad.net/quark.htm

Review: QuarkXPress 7
   Overview of the newst software build including screen shots. By Jay J. Nelson, Editor-in-Chief, Design Tools Monthly,
   http://www.creativepro.com/story/review/24327.html

Wikipedia: QuarkXPress
   Description of software includes history, usage, features, versions, and related sites.
   http://en.wikipedia.org/wiki/QuarkXPress