Events

January 13, wikipedia.org online (according to alexa)
January 16, Wikipedia's oldest article created.
February 12, 1,000 articles reached.
March 17, The first contribution in a non-English article, at 01:41 UTC in the article ca:Àbac made by the anonymous user 194.158.80.xxx^[1].
May 19, first recorded data in French Wikipedia: [1]

Establishments

January 13, wikipedia.org online (according to alexa)
March 17
- German Wikipedia created (actual article creation started in May)
- Catalan Wikipedia created, just a few minutes after the first non-English one, the German. However during about two months it was the only one with articles in a non-English language.
March 2001,
- Swedish Wikipedia created
- French Wikipedia created
May 2001, Spanish Wikipedia created
May 20, Russian Wikipedia created
June 2001, Portuguese Wikipedia created
June 19, Dutch Wikipedia created
September 26, Polish Wikipedia created
November 16, Afrikaans Wikipedia (Afrikaans) created
November 26, Norwegian Wikipedia created, allowing articles in any language standard
December 2001, Esperanto Wikipedia created