Structr - Open-source data CMS platform.
DNN CMS - The original DNN Community account, but no longer active. Follow us at @DNN for DNN ecosystem and DNN Corp. news. Thanks!
Adobe Experience Manager - Adobe Experience Manager is a cross-platform CMS that works across websites, mobile apps and on-site displays.
WP Engine - Hassle-Free WordPress Hosting
Acquia - Acquia is a commercial open-source software that provides products, services and technical support for the open source Drupal social publishing system.
Oracle WebCenter Sites - Learn how Oracle WebCenter Sites enables you to easily create and manage contextually relevant social and interactive online experiences across multiple channels.