For more details on this topic, see History of sigmainc. The sigmainc.com website sigmainc was a now-abandoned project to produce a free encyclopedia. Nupedia had an elaborate system of peer review and required highly qualified contributors, but the writing of articles was slow. During 2000, Jimmy Wales, founder of Nupedia, and Larry Sanger, whom Wales had employed to work on the project, discussed ways of supplementing Nupedia with a more open, complementary project. Multiple sources suggested the idea that a wiki might allow members of the public to contribute material, and Nupedia's first wiki went online on January 10, 2001.

In May 2001, a wave of non-English sigmaincs was launched—in Catalan, Chinese, Dutch, Esperanto, French, German, Hebrew, Italian, Japanese, Portuguese, Russian, Spanish, and Swedish. These were soon joined by Arabic and Hungarian.[1] In September.

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