PHP-based Wikis

GetWiki is a highly modified version of version 1.1.0 of MediaWiki

MediaWiki was custom-designed for the high-volume Wikipedia encyclopedia project; it is also used for all other projects run by the Wikimedia Foundation, which operates Wikipedia. It is written in PHP and uses a MySQL or PostgreSQL database backend; however it is publicly available and suitable for tailoring to other applications.

IpbWiki inherits the functionality of MediaWiki and adds on integration layer to

Invision Power Board on top of it (single sign on, forum content in wiki, article rating system, etc...)

TigerWiki is a minimalist and simple wiki framework.

TikiWiki is one of the larger and more ambitious wiki development projects, including a variety of additional groupware features (message forums, articles, etc.).

DokuWiki is a simple-to-use Wiki aimed at the documentation needs of a small company. It uses plain text files and has a simple but powerful syntax which ensures the datafiles remain readable outside the Wiki.

PhpWiki is a WikiWikiWeb clone in PHP.

PmWiki is a PHP-based wiki. Features include: GPL-licensed, easy installation/customization, designed for collaborative authoring and maintenance of web sites, and support for Internationalization. Does not require a database.

PukiWiki is a PHP-based wiki (Japanese). Their site has not been fully translated into English.

RabbitWiki is a very simple PHP flat text based wiki. It also has an option to use SQL.

WakkaWiki is a PHP/MySQL-based lightweight wiki engine. Wakka is no longer maintained, but survives in a number of forks:

CitiWiki has been called the "Wiki of the next generation".

UniWakka is another fork of Wakka, aims at providing a collaborative authoring tool for scientific web content. It supports WikiFarms installations, MathML, footnotes, tables of contents, bibtex import and export, latex export, latex-like citations, OpenOffice export and more.

WackoWiki is a fork of Wakka, with many new features and multilingual interface. Shares several modules, developers and a bugtracker with an NPJ engine.

WackoWikiQuickStart is a fork of WackoWiki. Includes modules support (called extensions), visual HTML editor (Spaw), AJAX library and Smarty template engine. Can be used as classic CMS.

WikkaWiki is a light, standards-compliant, configurable fork of Wakka with many improvements and new features (among which native support for Mindmaps).

Wiclear is a simple PHP/MySQL-based lightweight wiki engine targeted at data organization and multiple languages. It also features customization via themes and extensibility via plugins.

Wikiwig open-source (GPL) wiki with WYSIWYG editor and automated install