Alfresco offers true Open Source Enterprise Content Management (ECM) – Document Management, Collaboration, Records Management, Knowledge Management, Web Content Management and Imaging.
Installation guides with snapshots, clear to follow
http://www.linuxdict.com/books/Alfresco.pdf
PS: The Alfresco installer also support console, so we can install minimal system. and install the Alfresco. no X is needed.
Details: http://wiki.alfresco.com/wiki/Main_Page