National Inventor Fraud Center
Provides information to inventors about invention promotion companies and how to market their invention themselves. http://www.inventorfraud.com/
Inventors Forum
Dedicated to assisting and educating early-stage inventors and entreprenuers.
United Inventors Association
Non-profit corporation formed to provide leadership, support, and services to inventor support groups and independent inventors.
Inventors' Workshops of America
Non-profit group of inventors, marketing executives, professional engineers, trades people and entrepreneurs, organized for the purpose of assisting others in the process of bringing their inventions to market through evaluation and other means.
Canadian Innovation Centre
Dedicated to assisting inventors and innovative companies. Services includes invention evaluation, technology due diligence, market research, and education programs.