Software
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.
Agility CMS
Agility CMS is a cloud-based content management system for building and managing responsive websites and apps.
Flextype
Flextype is super fast headless content management system with an elegant architecture and built-in smart cache.
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.
CouchCMS
With no knowledge of PHP required at all you can make any static web-page editable by your clients.
CSZ CMS
Home | CSZ CMS is a content management system, to manage all content and settings on the site. This should make your website fully responsive with ease.
Rooftop
Rooftop is a open source and managed, API-only implementation of the WordPress CMS. With Rooftop, developers can harness the power of WordPress and write frontends in any language. Rooftop can be used to build websites, web applications and mobile applications.
SilverStripe
Silverstripe CMS is designed to be simple to learn and easy to use. Whether updating a page or publishing multiple pages on a large scale site. Give access to edit only specific areas of your site. Architected to safeguard your data from malicious activity or data-loss, even while scaling up complex sites.