PlikiWiki

(Archive.org link)

The primary goal of this  wiki is the documentation of the engine which serves it – PlikiWiki, a fork of the WikiWikiWeb-engine. Notable features include:
 * Flat-file database for fine-grained edit locks;
 * Individual wiki pages can be marked read-only;
 * Title and full-text searches;
 * Cache and retrieve of HTML-formatted page body text;
 * Wiki page metadata for preserving page creation, lastmod, and edit counts.

As of 2009-06-29, the live wiki version is PlikiWiki/1.1b Test. However, the wiki / wiki engine now seems to be, and the last capture by the Internet Archive WaybackMachine was September 2009.