Tips for switching your team to a SharePoint open source alternative: 
MediaWiki is many IT professionals’ first exposure to wikis. By virtue of being the platform behind Wikipedia, MediaWiki’s familiarity makes it a compelling open source alternative to proprietary technology like Atlassian Confluence, which is common with developers, and SharePoint, the default corporate collaboration platform.
read more: Opensource.com willkelly
Supporting Open Source.
Have you tried: Farking?