MediaWiki
A free and open source wiki software
Screenshots
Hunter's comment
If you want to create a media wiki for learning purposes similar to Wikipedia, then you should consider to pick MediaWiki as a solution.
MediaWiki is an open source application that can be used for all wikis, as well as on Wikipedia.
You can install it on localhost or on another server, let me show you one example of learning media developed by SpeedyWiki that uses MediaWiki as its software.
http://opensource.telkomspeedy.com/wiki/index.php/Main_Page
If you plan to make media like Wikipedia, I highly recommend you to try this MediaWiki out, one of the projects from Wikimedia foundation.
Link
https://www.mediawiki.org/wiki/Download
Contributors
Hunter: 
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