This document summarizes Wikipedia and various wiki engines. It discusses the history of Wikipedia, highlighting key milestones from its launch in 2001 to reaching 2 million articles in English by 2007. It also describes several popular wiki engines like DokuWiki, PhpWiki, and TWiki, noting their features such as storage options and support for additional services. Finally, it provides a case study on the DokuWiki engine, outlining its targeted uses, syntax, and administrative features.