Wiki Tools

MediaWiki Wiki Tool
MediaWiki is a free software wiki package originally written for Wikipedia. It is now used by several other projects of the non-profit Wikimedia Foundation and by many other wikis. 

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PmWiki Wiki ToolPmWiki is a system for collaborative creation and maintenance of websites. Pages created with pmWiki look and act like normal web pages, except they have a link that makes it easy to modify existing pages and add new pages into the website. 
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TWiki wiki toolTWiki is a flexible, powerful, and easy to use enterprise wiki, enterprise collaboration platform and knowledge management system. It is a Structured Wiki, typically used to run a project development space, a document management system, a knowledge base, or any other groupware tool, on an intranet or on the internet. Web content can be created collaboratively by using just a browser. Users without programming skills can create web applications. Developers can extend the functionality of TWiki with Plugins.