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Nucleus CMS

Grav is a modern free and open source flat-file content management system. With Grav, you can publish content and build sites in a fast, flexible and simple manner with the file-based web platform. Grav requires zero installation and is just an zip archive that can be extracted to start using the CMS. Grave also comes with a powerful package management system that allow you to extend the feature set of Grav CMS. With the package management system you can install and upgrade themes and plugins written specifically for Grav. The software is written in PHP and released fully free and open-source under the MIT License.

With Automad you can manage content easier than ever. Automad is a file-based content management and template engine that allow you to create fast website without the need of a database. Instead all content is stored in human readable text files which makes it easy to put a whole site under version control with Git. The elegant admin panel provided by Automad includes a block editor and the in-page editing capability. You can also extend the core of Automad by creating your own packages or making use of the once already created by the community.

Statamic is a flat file based content management system written in PHP. With Statamic you can build better and faster websites that are easy to manage. Statamic features over 40 field types, drag & drop navigation builder, revision and content history, inline content editing, asset management, plugin architecture and real-time collaboration that makes content management a breeze.

ButterCMS is a commercial headless content management system and content API. With ButterCMS you can quickly setup your very own headless CMS that supports In-browser editing. Where you can quickly find and filter your images and files, update and schedule content and serve you assets over a content delivery network.

Quanta is a free, open source Content Management Framework thought for programmers and used for the creation of new-generation websites and applications.

Exponent CMS is a notable free and open source content management system that contains its own independent modular software framework of enterprise level.