True Food Now
The True Food Now website was created as a part of Greenpeace's Genetic Engineering campaign in 2000. It is now it's own organisation operating in the USA. The website is full of resources and ideas for pratical activism.
Friends of the Earth
Friends of the Earth International is a federation of autonomous environmental organizations from all over the world. They actively campaign against GMO's and other environmental issues. This link is to their international site, they also have many national websites.
Ground up
The Groundup Website is the genetics section of the ASEED Europe website. ASEED Europe is the European part of an international network of (action) groups working on environment and social justice issues.
Physicians and Scientists for Responsible Genetics
Physicians and Scientists for Responsible Genetics - New Zealand, (PSRG), are affiliated to the international association of Physicians and Scientists for the Responsible Application of Science and Technology, (PSRAST).
Consumers International
Consumers International (CI) supports, links and represents consumer groups and agencies all over the world. CI launched a GM campaign in October of 2004. The campaign aims to stop the spread of GM crops until stringent, internationally agreed regulations are in place and there are clear demonstrated benefits to consumers, farmers and the environment.