Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.Rating:
Wikimedia is a global movement whose mission is to bring free educational content to the world.Rating:
Wikibooks is a Wikimedia community creating a free library of educational textbooks that anyone can edit.Rating:
Wikiversity is a Wikimedia Foundation project devoted to learning resources, learning projects, and research for use in all levels, types, and styles of education from pre-school to university, including professional training and informal learning.Rating:
Wikivoyage, the free, worldwide travel guide that anyone can edit.Rating:
Wikimedia Foundation Inc.
149 New Montgomery Street
San Francisco 94105 US