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Strapi is a free and open source headless CMS developed with JavaScript for Node.js. The software makes it really simple to generate REST and GraphQL APIs. Simply create your database schema and relationships in the Strapi admin panel UI, and Strapi will auto-generate API endpoints to represent the data structures provided. Strapi comes packed with features you come to expect from normal CMS's such as authentication, authorization, content management and a media library. The software can be used for free and can be self-hosted on any server and platform. Extra enterpise functionallity is currently being developed, and will be sold at cost.

Ghost is a free and open-source headless CMS and blogging platform developed by Ghost Foundation. With Ghost you can manage content in style, the user experience provided by the software is intuitive and encourages writing. Ghost is written in JavaScript for the Node.js platform and is released under the MIT license.

WordPress powers roughly 30% of all web pages online. It's a free and open source CMS designed and developed for self-hosted publishing by Automattic, Inc. The software is written in PHP and utilize either MySQL or MariaDB as a database, and is compatible with most web hosts. Wordpress includes a plugin architecture and a templating system that can be used to extend and customize your website. These are commonly known as WordPress plugins and WordPress themes and make up a whole open source and commercial eco-system where anyone is free to create products for the platform. 

Contentful is a modern headless CMS that integrates with development teams and their workflows. With an API-first approach, implementing Contentful into an existing application is easier than ever. The content management system features a customizable interface, content modeling, and cloud-based governance. With Contentful you can have a RESTful API setup in minutes, which integrates well with your existing architecture.

Over 9,000 brands worldwide use Optimizely Content Cloud to power their content management. Optimizely Content Cloud is developed and maintained by Optimizely and was previously known as Episerver Content Cloud. With Optimizely Content Cloud your business can thrive in an ever more content driven world of commerce, by combining and integrating features for web-based content management and Optimizely's digital marketing suite. Creating an omni channel experience for your content management team as well as an immersive end-product for your customers.

With Contentstack, content and marketing teams are able to publish content with a much higher frequency than ever before. Contentstack brings business and technology teams closer together by providing a personalized, omnichannel experience with a visual editor alongside content scheduling and publishing management tools.