Here are links to some wonderful animal rescue and welfare organisations around the world:

The Netherlands:
Dierenambulance and Hospitaal Den Haag – Animal Ambulance & Hospital
Haags Dierencentrum – Animal shelter
Vogelasiel De Wulp – Bird sanctuary
Egelopvang Den Haag – Hedgehog shelter
Amivedi – Lost & found pets
Dieren Bescherming – Lost & found pets
Chipnummer.nl – Multi microchip company database search

Australia: 

Oscar’s Law
“Oscar’s Law is a very simple campaign: it enables everyone to make a stand and tell the government that “We do not want companion animals factory farmed anymore” and “We no longer want the pet industry to mislead us about what is acceptable for our animals”.”

Prisoners for Profit: Puppy breeding factories
For almost 20 years Debra Tranter has worked tirelessly to abolish the cruel practice of factory farming dogs for profit. She founded the campaign to abolish puppy farming in 1993 and has successfully shut down two puppy farms in Victoria, Australia. This is her journal.

Please note that a comprehensive list of Australian rescue organisations can also be found in the PetRescue Directory

9 Lives Cat Rescue
Animal Protection Society of Western Australia
Australian Working Dog Rescue
Bast Cat Club
Beagle Rescue
Boxer Rescue Victoria
Cavalier Rescue Victoria
Dachshund Rescue Australia
Desperate for Love Dog Pound Rescue
Dogs Across Australia
Dogs’ Refuge Home
Edgar’s Mission
Good For Dogs
Greyhound Adoption Program
Greyhounds as Pets Western Australia
Half Way Home
Lort Smith Animal Hospital
Melbourne Animal Rescue
Paws
PetRescue
Pets Haven Foundation
Pug Rescue
Rescued with Love
Rottweiler Rescue WA
Save-A-Dog Scheme
Staffy and Bully Breed Rescue
VicDog Rescue
Whippet Rescue
World Animal Net
YAPS – Young Animal Protection Society

Bali: 
Bali Street Dogs

Thailand: 
Dog and Cat Rescue Samui Foundation
Phuket – Soi Dog Foundation

USA:
Helen Woodward Animal Center
“Helen Woodward Animal Center’s passionate belief that animals help people and people help animals, through trust, unconditional love, and respect, creates a legacy of caring. Sharing this philosophy with others, the Center inspires and teaches, locally and globally, the importance of the animal-human bond.”

Best Friends
“Best Friends Animal Society is guided by a simple philosophy: kindness to animals builds a better society for all of us…”