International League for the Protection of Horses (NZ) Inc 
The charity's worldwide activities include rescue and rehabilitation, education and training, scientific research, and lobbying for the improvement of legislation and Codes of Practice in respect of equine welfare.
http://www.horsetalk.co.nz/ilph/Friends of the Cyprus Donkey 
"The one and only donkey sanctuary in Cyprus, where a growing number of old, sick and unwanted donkeys share a happy life."
http://www.windowoncyprus.com/friends_of_the_cyprus_donkey.htm
SEPE 
A Spanish horse and donkey rescue organization that promotes welfare education for equine owners, and lobbies for equine welfare laws to be implemented and made statute. Includes news, donation page, and links.
http://www.sepeonline.net
Horse Trace.com 
Service dedicated to reuniting horses and owners, tracing and locating stolen horses.
http://www.horsetrace.com
PMU Foal Acquisition Network, Inc. 
Volunteer, nonprofit organization working to place PMU foals into good homes in the United States and Canada. Includes area contacts, foal list, adoption information, FAQs, drop off points, and membership information.
http://www.pmufani.org