World Society for the Protection of Animals (WSPA)  
   Campaigns against using animals for commercial, research, sport or entertainment purposes. Offers news, features, press notices, action points and fundraising ideas.
   http://www.wspa-international.org/

Humane Society International (HSI)  
   International arm of HSUS (Humane Society of the United States). Oversees and coordinates efforts worldwide, addressing wildlife, companion and farm animals, and the use of animals in research and testing.
   http://www.hsus.org/ace/11672

Open Rescue  
   Focussed mainly on factory farming, giving aid, rescue and veterinary treatment to any animal known to be suffering and in pain. Includes reports from rescue teams around the world.
   http://www.openrescue.org

PETA2  
   Educates young people about veganism and vegetarian lifestyles.
   http://www.peta2.com

International Fund for Animal Welfare (IFAW)  
   Works to stop all commercial exploitation and trade of animals by changing policies and practices through campaigns and grants to other organizations. Includes breaking news, publications, media center and current campaigns. Headquarters in Massachusetts,
   http://www.ifaw.org/

People for the Ethical Treatment of Animals (PETA)  
   Operates under the principle that animals are not ours to eat, wear, experiment on, or use for entertainment. Includes information on campaigns, action alerts and how to live a vegan lifestyle. Headquarters in Virginia, USA.
   http://www.peta.org/

The Institute for Animal Associated Lifelong Learning  
   A humane education organization with information and activities for teachers and parents to develop in children empathy, compassion and respect for animals and people.
   http://www.aallinstitute.ca/