Free Software
FrontAid CMS
FrontAid CMS is a decoupled and Git-based content management system. Content is stored in your own Git repository in the JSON text format. It works with all your current tools and you always own your data.
Mixcore CMS
Mixcore CMS is an Open Source Enterprise ASP.NET Core / Dotnet Core CMS for building amazing digital experiences. It's made by a dedicated community. Anyone can use it, and it will always be free.
GeniXCMS
GeniXCMS is a Simple and Lightweight CMS and Framework. It's PHP Based CMS. Free and Opensource.
Flextype
Flextype is super fast headless content management system with an elegant architecture and built-in smart cache.
CouchCMS
With no knowledge of PHP required at all you can make any static web-page editable by your clients.
Subrion
Subrion is a PHP/MySQL based CMS & framework that allows you to build websites for any purpose. Yes, from blog to corporate mega portal.
LightCMS
Easily Create Fantastic Websites with Highly Customizable Templates & Intuitive Tools for...
Agility CMS
Agility CMS is a cloud-based content management system for building and managing responsive websites and apps.