Content Management System for Documentation of a Research Project

I am working on documentation of a Research Project at my college.

I am searching for a mediawiki style content management system with good user privilege features so that the sections of wiki accessible to the wiki user will map to th开发者_JS百科eir privilege level.

Users who do not have an account will not be able to access the documentation. I am not sure mediawiki has that feature. Please suggest some options to select from.

DokuWiki seems pretty interesting for this purpose. Tested it myself and it is quite simple to install and manage.

http://www.dokuwiki.org/dokuwiki

You can also look for SharePoint 2010 Foundation which is free of cost http://sharepoint.microsoft.com/en-us/buy/Pages/Licensing-Details.aspx.