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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.

Jekyll is a static site generator written in Ruby. With Jekyll, you can transform your plain text into static websites or blogs. No more database, and cumbersome updates and install, simply focus on your content. In Jekyll, permalinks categories, pages, posts, and custom layouts are factored into the design, so you can get started writing content, right away. For layouts and template, Jekyll uses the Liquid templating language which allow you to design and structure a site to your liking. In a nutshell Markdown, Liquid, HTML and CSS goes in, and out comes a static site ready for deployment.

With no knowledge of PHP required at all you can make any static web-page editable by your clients.

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.

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.

Kirby is a flat file content management system written in PHP. Kirby adapts to any project and can be used by developers, designers, creators and clients to create websites for businesses and personal use.