MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia. $5/month
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MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia. It is now used by several other projects of the non-profit Wikimedia Foundation and by many other wikis. MediaWiki is designed to be run on a large server farm for a website that gets millions of hits per day. MediaWiki is an extremely powerful, scalable software and a feature-rich wiki implementation that uses PHP to process and display data stored in a database, such as MySQL.
WikiMedia is the platform that was built specifically for WikiPedia, one of the largest and most popular websites in the world. For those who aren’t aware, this platform allows all users to create and edit documents freely, drawing from the expertise from everyone who wants to help. Changes are logged and tracked so administrators or moderators can roll them back or approve them depending on what is being entered. WikiPedia is well known for having massive amounts of information all in one place, though due to the fact that everyone can edit the pages, it isn’t always 100% accurate.
The system itself is really built and maintained with scale in mind. No matter how large or popular a site built with WikiMedia becomes, it will be able to operate without any issues. This does, however, come at a cost of increased system requirements that can become costly if a site becomes too big (or even if it is fairly small, compared to other wiki systems). The platform is very flexible, and can be customized to meet your exact needs no matter what type of wiki-site you’re working on.