CATIA Operators Exchange - An international nonprofit organisation consisting of CAD/CAM/CAE professionals involved with companies who are users of the Dassault Systemes CATIA software.
Catiaworld - Independent resource centre for CATIA, CADAM, DELMIA, ENOVIA, and SMARTEAM users worldwide.
Professional AutoCAD Users Group (PAUG) - Provides networking and peer support for AutoCAD and related software for Denver, Colorado, Wyoming and Rocky Mountain Front Range.