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The most popular/open source and well-known alternative to SharePoint is Alfresco;<br />
<a href="http://www.athento.com/en/alfresco-enterprise-platform/" rel="ugc">http://www.athento.com/en/alfresco-enterprise-platform/</a>&nbsp;<br />
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There are others as well, like Huddle (<a href="https://www.huddle.com/product/collaboration/sharepoint-alternative/?SSAID=389818" rel="ugc">https://www.huddle.com/product/collaboration/sharepoint-alternative/?SSAID=389818</a> ), Google drive or SamePage (<a href="https://www.samepage.io/sharepoint-alternative" rel="ugc">https://www.samepage.io/sharepoint-alternative</a>)
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The most popular/open source and well-known alternative to SharePoint is Alfresco;
http://www.athento.com/en/alfresco-enterprise-platform/ [http://www.athento.com/en/alfresco-enterprise-platform/] 

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

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There is no alternatives to SharePoint, just wannabe's....<br />
<br />
Maybe try this questions on a non-SharePoint forum.
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There is no alternatives to SharePoint, just wannabe's....

Maybe try this questions on a non-SharePoint forum.

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What is the best alternative (opensource or low cost) for SharePoint ? The main purposes are document version control and access control.<br />
Thank you!
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What is the best alternative (opensource or low cost) for SharePoint ? The main purposes are document version control and access control.
Thank you!

What is the best alternative for SharePoint ?

Microsoft Sharepoint is a software platform and family of software products used for collaboration and web publishing combined. These capabilities include developing web sites, portals, intranets, content management systems, search engines, wikis, blogs, and other tools for business intelligence and collaboration. SharePoint has a Microsoft Office-like interface, and it is closely integrated with the Office suite.

Microsoft SharePoint

Version control, also known as revision control or source control, is the management of changes to documents, computer programs, large web sites, and other collections of information. Changes are usually identified by a number or letter code, termed the "revision number," "revision level," or simply "revision." Version control systems (VCS) most commonly run as stand-alone applications, but revision control is also embedded in various types of software such as word processors and spreadsheets, and in various content management systems. Revision control allows for the ability to revert a document to a previous revision. Git, a widely-used VCS, has its own topic; other popular systems include CVS, Subversion, Team Foundation Server (TFS), Visual SourceSafe (VSS) and Perforce.