PhpWiki is a WikiWikiWeb clone in PHP. A WikiWikiWeb is a site where anyone can edit the pages through an HTML form. Multiple storage backends, dynamic hyperlinking, themeable, scriptable by plugins, full authentication, ACL's.
WorkingWiki is a MediaWiki extension that makes a wiki into a source-code repository, IDE, and compute server. It has special support for LaTeX projects, including sophisticated translation to HTML for display within the wiki page.
Lightweight library and programs for basic web programs (wiki, blog, etc) written in pure C99. Ideal for low-specced / embedded devices.
Articles Viewer WebSite that is perfect for technology, social updates
A WebSite that is good for technology news and social webpages and can be used for many other goals like medical website or tech-blog
A set of web utilities for managing MediaWiki.
The Mediawiki Pipes extension implements external data access and processing through a series of configurable nodes that form a Pipe. The net effect is to create a Wiki based application framework. See http://www.mediawiki.org/wiki/Extension:Pipes
With this simple extension to MediaWiki you can insert images without associated links or linking to arbitrary urls.
WagTools is an open source Firefox extension for Wikipedia editors. It provides some similar functionality to other Wikipeidia tools like Huggle and AWB.