Wiki Module

This Wiki module is an implementation of PhpWiki and therefore is available entirely free of charge under the GNU license agreement.

A wiki is a page or collection of Web pages designed to enable anyone who accesses it to contribute or modify content, using a simplified mark-up language. Wikis are often used to create collaborative websites and to power community websites. The collaborative encyclopedia Wikipedia is one of the best-known wikis. Wikis are used in business to provide Intranet and Knowledge Management systems. Ward Cunningham, the developer of the first wiki software, WikiWikiWeb, originally described it as "the simplest online database that could possibly work".
...From Wikipedia

The current version is v1.0.