Compare Kunstmaan vs. Contentful
Kunstmaan Agency has created a number of Symfony2 Framework Bundles to enable developers to create web applications with CMS features. It's not a complete product in itself, but offers flexibility for skilled developers to create easy to use site experiences for content creators.
Contentful is a pure CaaS (Content as a Service) player. It comes from Berlin, and is currently the global market leader for decoupled hosted content management.
CMSes vailable for comparison: BackBee, Bolt CMS, Concrete5, Contenta, Contentful, Cosmic.js, Craft CMS, Drupal 8, eZ Platform, Fork CMS, GraphCMS, Grav, Jarves, Joomla!, Kunstmaan, October CMS, Open Orchestra, Pagekit, Pimcore, PyroCMS 3, Reservoir, Spress, Sulu CMS, Symfony CMF, Symphony CMS