Bolt is a fresh and lightweight open source CMS for simple websites. Bolt strives to be as straightforward as possible for developers and is easy to use for content managers.
Coast is a small, open-source CMS, that makes static HTML-sites editable. Coast is perfect, if you don’t need a full-blown CMS, but a simple edit and safe mode for your client.
Craft is a modern content management system with a focus on a “content first” strategy. It aims to make life enjoyable for developers and content managers alike, and has a smart developer concept of its own.
Drupal is one of the most-used, open source CMS in the world. The core of Drupal is reduced down to the essentials, while the system is largely extensible with plugins and modules. Drupal sets a special focus on accessibility.
Grav is a modern and open-source Flat-File-CMS. Grav has been created by Andy Miller from RocketTheme and it quickly became popular in the community. One of its specials: Grav has its own package manager.
HTMLy is a lightweight, flat-file blog software that prioritizes simplicity and speed. If you plan a simple, standard-blog, for example, to accompany your next web project, then HTMLy is probably a good choice.
Kirby is a well established, professional flat-file CMS with a great continuity. Kirby was first published in 2009, but, due to the continuous development, it is as fresh and modern as its juvenile competitors.
Sitecake enables authors to edit static web-pages inline. These kind of CMS or website-editors are perfect, if you want to create a simple, static website that is subsequently editable.
Statamic is a premium Flat-File-CMS with a modern code base and an extensive set of functionalities. You can create simple blogs as well as websites of mid-range complexity. All without the need for a database.
TYPO3 is one of the most widespread Content Management Systems, with a history dating back to 2000. The CMS is pretty complex, so it’s mostly used in the world of big business.
WordPress is not just a blog-software anymore. Today, WordPress is an extremely flexible and feature-rich content-management-system that runs millions of websites all over the world.