UniWakka is a Wiki Engine derived from WakkaWiki external link (dead link), a light-weight, easy to install and to configure collaborative editing software for web content. Derived from Wakka-0.1.3-dev, UniWakka is mostly intended for an university or scientific environment

WikkiTikkiTavi is an amazing wiki engine --- it is a PHP script that runs wiki sites. Wikis are a revolutionary new form of collaboration and online community. Although there exist many WikiEngines and wikis around the world, this wiki is dedicated to the WikkiTikkiTavi and those of you who might want to use it for your wiki.

Wikepage is a wiki-standart, easy to use and small wiki software derived from Tipiwiki2 Wikepage has some security features that Tipiwiki does not have, like password protected structure, and 4 patched important security flaw, table support, upload support, multilanguage and multisite support...etc...

WikkaWiki is a flexible, standards-compliant and lightweight wiki engine written in PHP, which uses MySQL to store pages. Forked from WakkaWiki. Designed for speed, extensibility, and security. Released under the GPL license.

PmWiki is a wiki-based system for collaborative creation and maintenance of websites. PmWiki pages look and act like normal web pages, except they have an "Edit" link that makes it easy to modify existing pages and add new pages into the website, using basic editing rules. You do not need to know or use any HTML or CSS. Page editing can be left open to the public or restricted to small groups of authors.

DokuWiki is a standards compliant, simple to use Wiki, mainly aimed at creating documentation of any kind. It is targeted at developer teams, workgroups and small companies. It has a simple but powerful syntax which makes sure the datafiles remain readable outside the Wiki and eases the creation of structured texts. All data is stored in plain text files – no database is required.

MediaWiki is a free software package originally written for Wikipedia but is now run on other projects of the non-profit Wikimedia Foundation and many other wikis.