DocGen - Static website generator
OnBase - OnBase is an enterprise content management and process management software suite.
LogicalDOC - A document management system such as LogicalDOC can help your organization better manage business processes and put order in the chaos of documents every day run your business.
IBM FileNet - Enterprise Content Management platform for large businesses
openSourceCM - Web-based legal document processing and contract management
Structr - Open-source data CMS platform.