CADAM Drafting
   Information about the 2d drafting solution within the CATIA product family from Dassault Systems.
   http://www.cadam.com/

CATIA IUA Functions by EMA
   Customization and extension functions for CATIA, with free download of some examples.
   http://www.ema3.com/

CATIA Operators Exchange
   COE is dedicated to the exchange of information about CATIA and other Dassault Systèmes software products.
   http://www.coe.org/

Catia V5 Users Group
   Mailing list dedicated to helping users with the Catia family of work benches.
   http://groups.yahoo.com/group/catiav5/

Catiaworld.com
   An independent resource for CATIA and other CAD/CAM software by Dassault. Offers business listings for engineering, hardware, software, and recruitment, with more information for registered users.
   http://www.catiaworld.com/

IBM Engineering Solutions / CATIA
   CATIA is marketed worldwide by IBM.
   http://www.catia.ibm.com/catmain.html

Practical Catia
   Catia training and job listings involving CATIA CAD/CAM/CAE skills.
   http://www.practicalcatia.com/

Rainer Sieber CAE Systems
   Voltool is a supplementary product (IUA) for easier and faster work in surface design and topology handling with CATIA V4.
   http://voltool.caesystems.com/