Wikipedia
Wikipedia gained early contributors from Nupedia, Slashdot, and from people who looked it up. It grew to about 20,000 articles, and 18 languages by the end of 2001. By late 2002 it had 26 languages, 46 by the end of 2003, and 161 by the end of 2004. Nupedia and Wikipedia both existed until Nupedia's servers were stopped in 2003. After this, its text was incorporated into Wikipedia. The English Wikipedia passed the 2 million-article mark on September 9, 2007, making it the largest encyclopedia ever assembled, even larger than the Yongle Encyclopedia (1407), which had held the record for exactly 600 years.