UseModWiki

UseModWiki is a rather vintage wiki engine by Clifford Adams, as it's markup and appearance are a direct descendant of the same engine of the very first wiki, WikiWikiWeb.

In fact, much like it's predecessor, it stores pages as flat files instead of using a database, has links in CamelCase, and has a very simplistic, no frills appearance.

The name comes from the fact the very first wiki it was used for was the Usenet Mod'eration Wiki.

It is still being used on one of the oldest wikis on the Internet, the MeatballWiki.