MediaWiki is a Web-based collaborative editing environment. Originally built for the online encyclopedia project Wikipedia, it's geared to support a large number of users and pages.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.
This release includes further cross-site-scripting
protections for Internet Explorer, as well as some
bugfixes. Image pages work again when thumbnailing
is disabled. MySQL 5.0 strict mode should now
work, and there is experimental support for
explicitly declaring the UTF-8 charset in the
database. This has been tested with MySQL 5.0.15,
but should work on 4.1 as well.