American Design Drafting Association

The ADDA is an individual membership society for the design drafting community across all industries.
http://www.adda.org/

CAD Society

A not-for-profit organization which has the goal of encouraging open communication among those in the CAD industry.
http://www.cadsociety.org/

International CAD Council

The ICC is an organization dedicated to helping design organizations and schools that promote good design practices and use the latest in technology.
http://www.icadc.com/