OpenKM alternatives

OpenKM is a web base document management application that uses standards and Open Source technologies. OpenKM provides full document management capabilities including version control and file history, metadata, scanning, workflow, search, and more. It also allows the social activities around content to be used to connect people to other people, information to information, and people to information; helping to manage, more efficiently, the collective intelligence of the human resources of the company.
OpenKM alternatives are:
Alfresco, Nuxeo, SharePoint, KnowledgeTree