What is the best alternative for SharePoint ?

What is the best alternative (opensource or low cost) for SharePoint ? The main purposes are document version control and access control.
Thank you!
Claws HoEngineerAsked:
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The most popular/open source and well-known alternative to SharePoint is Alfresco;

There are others as well, like Huddle (https://www.huddle.com/product/collaboration/sharepoint-alternative/?SSAID=389818 ), Google drive or SamePage (https://www.samepage.io/sharepoint-alternative)

Try with owncloud and openkm


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Walter CurtisSharePoint AEDCommented:
There is no alternatives to SharePoint, just wannabe's....

Maybe try this questions on a non-SharePoint forum.
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