MediaWiki is the software used for Wikipedia ( http://www.wikipedia.org ) and the other Wikimedia Foundation websites. Compared to other wikis, it has an excellent range of features and support for high-traffic websites (Wikipedia peaks at 380 requests per second as of August 2004).
Learn all about it at http://www.mediawiki.org
From the TiddlyWiki web-site …
TiddlyWiki is a free MicroContent WikiWikiWeb created by JeremyRuston and a busy Community of independent developers. It’s written in HTML, CSS and JavaScript to run on any modern browser without needing any ServerSide logic.
One of the neatest features of TiddlyWiki is that it is entirely self-contained in a single HTML file. The file contains the actual hypertext document, and the JavaScript, CascadingStyleSheets and HTML necessary to both view and edit it. This means that it is trivial to host a TiddlyWiki on a website, or to distribute one by email. And anyone with a reasonably recent web browser will be able to read and edit it
Currently at revision 2.2.4 TiddlyWiki is published under an OpenSourceLicense.
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