MediaWiki

MediaWiki is the wiki used by Wikipedia. It's powerful, scalable software that's designed to be run on a large server farm for a web site that gets millions of hits per day.

Pages use MediaWiki's wikitext format, so users without knowledge of XHTML or CSS can edit them easily.

When a user submits an edit to a page, MediaWiki writes it to a database, but without deleting the previous versions of the page, thus allowing easy reverts in case of vandalism or spamming. MediaWiki can manage image and multimedia files, too, which are stored in the filesystem. For large wikis with lots of users, MediaWiki supports caching and can be easily coupled with Squid proxy server software.

MediaWiki is similar to:

TikiWiki, Twiki, XWiki

MediaWiki is used for:

Wiki

Who uses MediaWiki:

business user, home user

Features:

Links with shortcuts, arrangement depends on skin
Skins: Different ways to present the site.
o Monobook, a modern skin with accesskeys and tooltips
User styles: Users can adapt the look and feel of the site through custom CSS on their user pages.
"Stub" threshold: Users can see links to articles below a certain size rendered in a different color
Printable versions of articles can be generated
Auto-number headings in an article (optional)
Intra-page Anchors (automatically generated for headings, and also with <div id="tagname">...</div>)
Generate a table of contents for long articles (optional)
Automatically turn ISBN numbers into links to an editable list of booksellers
XHTML-compatible output (or darn close to it), tidy integration
Database-driven (MySQL and PostgreSQL are both supported)
Parser caching: rendered pages are cached to reduce redundant processing
Output caching: complete page output can be optionally saved as static HTML files for serving to other clients; support for Squid proxies
Cookie-based account and login system, but anonymous users can also edit pages
All revisions of an article are stored (optionally compressed)
RSS syndication available for many special pages, such as Special:Newpages and Special:Recentchanges
RDF metadata
And Much More!