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One of the most popular sites within the public domain is Wikipedia (http://en.wikipedia.org), an encyclopedia written collaboratively by volunteers from all around the world and anyone with internet access can make changes to Wikipedia articles. Since its creation in 2001, Wikipedia attracts 684 million visitors yearly. There are more than 75,000 active contributors working on more than 10,000,000 articles in more than 260 languages. That is a collaboration project to envy.