Change.org is a worldwide petition website, based in California, USA, operated by the San Francisco-based[2] company of the same name, which has over 400 million users[3] and offers the public the ability to promote the petitions they care about to potential signers,[4] including 196 countries which are "creating change" in their communities
Avaaz is a U.S.-based nonprofit organization launched in January 2007 that promotes global activism on issues such as climate change, human rights, animal rights, corruption, poverty, and conflict. In 2012, The Guardian referred to Avaaz as "the globe's largest and most powerful online activist network".
GetUp! is an independent progressive Australian political activist group. It was launched in August 2005 to encourage Internet activism in Australia, though it has increasingly engaged in offline community organising.