Wikipedia is an ambitious project to produce a free and complete encyclopedia in every language, written by hundreds of volunteers working collaboratively together.

Wikipedia began in January 2001, and already features nearly 200,000 articles in the English version, with more being added and improved all the time.

Much like the Open Directory Project uses volunteers to build and maintain its catalog of web pages, Wikipedia encourages participation from the web community. Unlike the ODP, however, Wikipedia is a truly open community. Anyone, including you, can edit any article right now, without even having to log in.

EN - Wikipedia - 198189 articles - http://www.wikipedia.org/
DE - Wikipedia - 48045 Artikel - http://de.wikipedia.org/
FR - Wikipedia - 25506 articles - http://fr.wikipedia.org/
PL - Wikipedia - 21454 haseł - http://pl.wikipedia.org/