SilverStripe is a free and open source Content Management System and Framework for creating, maintaining websites and web applications.
A content management system that enables cross-platform, multi-device online publishing. Businesses employ Contentful to publish editorial content for web apps, mobile apps, and, ultimately, any connected devices.
GraphCMS is a headless CMS based on GraphQL. It lets you build a hosted GraphQL content API for your sites and apps while it gives content editors all the tools they need to get the job done.
prismic.io provides a CMS backend for websites. Its API-based approach focuses on design and technology freedom for developers, while delivering a great user experience in the publishing backend. prismic.
Cloud CMS is a headless, API-first approach to content management, built around JSON. It delivers enterprise features, Git-like versioning, flexible content models, allowing your business users create, manage and publish fresh content with ease.
Kontent by Kentico, a Content-as-a-Service solution, gives organizations control over their entire content lifecycle while freeing developers to build compelling digital experiences using the technologies of their choice.