Here are some links to the websites of some organisations I've come across that are doing great work in the field of conservation. Have a look if you're interested or looking for information on stuff. Contact me if you have any others to recommend :)

A digital library of photos and recordings of the world's species, an "online Noah's ark" of today's species

Birdlife International
An international conservation organisation working to protect the world's birds and their habitats

Caring Consumer
A PETA initiative, consisting of a database of cruelty-free products. Have a look if you want to know what products are or aren't tested on animals

Convention on the International Trade in Endangered Species

EDGE of Existence
A research and conservation initiative focused on the world's Evolutionarily Distinct and Globally Endangered species

Friendicoes SECA
A society working to help stray and abandoned animals in the Delhi-Agra belt

Greenpeace International

International Fund for Animal Welfare

IUCN Red List

National Geographic

People for the Ethical Treatment of Animals

Sea Shepherd

Take Part
Choose your cause and take part

Wildaid / Wildlife Alliance

Wildlife SOS
India's most successful animal rescue organisation

WWF International