PmWiki

PmWiki is a Wiki software package, similar to other wiki packages, such as MediaWiki and TikiWiki. It's a flat-file, PHP.

Features
PmWiki is written in PHP, and by default stores it's data in a flat-file store. It is able to be configured to utilize MySQL, MSSQL, as well as a variety of other data stores through it's plugin system.

Design
The current version of PmWiki is 2.2.13. The core package is very feature-limited, as proscribed by the PmWiki philosophy of keeping everything in the core to a minimum, and allow ease of extensibility.