A Virtual Appliance Powers Wiki!

MediaWiki is a virtual appliance that powers Wikipedia. It is a darn nice piece of software, well proven given the enormous community of use it sustains over at Wikipedia - and many, many other smaller sites. This appliance contains all the necessary software, including operating system, database and MediaWiki, to run a wiki installation as a "black box".

Visit the MediaWiki Project Page for more details. You may even download MediaWiki to create and manage content collaboratively.