Structr - Open-source data CMS platform.
OnBase - OnBase is an enterprise content management and process management software suite.
Acquia - Acquia is a commercial open-source software that provides products, services and technical support for the open source Drupal social publishing system.
Documentum - Enterprise Content Management platform for large businesses
Adobe Experience Manager - Adobe Experience Manager is a cross-platform CMS that works across websites, mobile apps and on-site displays.
DocuShare by Xerox - DocuShare is a content management system developed by Xerox.