Open Source Software for Self-Hosted
Netlify CMS
Netlify CMS is a static site generator that is based on client-side JavaScript with a reusable APIs and prebuilt Markup. Simply pull in Netlify CMS to /admin of you site and you have an SPA (Single Page Application) admin panel that can edit content stored in a Git repository. Serving applications like this, the JAMstack way, improves performance, lowers cost of scaling and provides for a better development experience.
WonderCMS
WonderCMS is the smallest flat file content management system. The CMS is built with PHP and has been developed since 2008. No initial configuration required to setup the WonderCMS, the installation is straight forward and simply requires you to unzip and upload 5 files.All data within WonderCMS is structured as JSON format and the flat file nature of the content management system also allow you to migrate hosts easily by transfering files across, no database migration required.
MASA CMS
MASA CMS is an Enterprise Content Management platform based on open source technology. MASA CMS is a fork of the last open source version of the popular content management system Mura. With MASA CMS you can quickly and efficiently deliver personalised websites and mobile applications. The content management system can easily be installed on-premise or your favorite cloud hosting provider like AWS, Azure, DigialOcean, Linode and many others.
Exponent CMS
Exponent CMS is a notable free and open source content management system that contains its own independent modular software framework of enterprise level.
Mura
The Mura CMS platform makes it easier & faster to build and update websites. The content management system was created to free content managers from distraction of multiple tools, the worry of steep learning curves, and a clear need to tell the right story, to the right audience, at the right time. Mura is loved by content managers, content contributors, marketers and developers alike.
Daptin
With Daptin you can build faster, more capable APIs over your data that works across all types of frontend. Daptin is a free and open-source headless CMS server written in Go. Daptin can be used as a backend for both mobile and web applications and provide ready-to-go REST and GraphQL API infranstructure.
Bludit
Bludit is a content management system that allow you to build your own website or blog in seconds, it's completely free and open source. Markdown support. The flat file architecture of Bludit makes your websites extremely fast, while still allow you and your team to manage content the way you would in other popular content management systems like WordPress, Joomla and Drupal. Without relying on databases like MySQL or complicated DevOps workflows.
Quanta CMS
Quanta is a free, open source Content Management Framework thought for programmers and used for the creation of new-generation websites and applications.
dotCMS
A hybrid content management system that includes classic CMS and Headless CMS features. With dotCMS content managers can create content that fuels the brand experience. The API-first approach provided by the headless part of dotCMS allows developers to build extremely fast front-ends with popular third-party front-end framework and deliver content optimally. The content management system allows content creators to build engaging and memorable content that can be reused across sites.
OpenCMS
OpenCMS is based on Java and XML technology that allows you to build highly customizable and interactive websites and portals. The open-source content management system includes a WYSIWYG editor and fully-featured Template Engine which is fully compliant with W3C standards.