TCPUG.org

PTC- Product Lifecycle Management Software Solutions
http://www.ptc.com/

ptcuser.org - The resource center for Pro/ENGINEER® and Windchill® users
http://www.ptcuser.org/

Pro/E Community – For users of Pro/ENGINEER, Windchill, and other PTC affiliated products
http://www.proe.com/

ProENGINEERtips.com - Free Tips & Tutorial
http://www.proengineertips.com/

Design-engine.com – Industrial Designers and Product Engineer resource for industrial designer jobs to Pro/E jobs, articles on design and engineering, events and design firm press releases.
http://www.design-engine.com/

The Pro/E WebRing – a collection of sites that contain useful information about Pro/ENGINEER and Pro/Mechanica.
http://g.webring.com/hub?ring=proering