Plone
Plone CMS: Open Source Content Management — Plone.org
18 Alternatives To Plone
Confluence
Confluence is content collaboration software that changes how modern teams work
Drupal
Drupal - the leading open-source CMS for ambitious digital experiences that reach your audience across multiple channels. Because we all have different needs, Drupal allows you to create a unique space in a world of cookie-cutter solutions.
Flask
a microframework for Python based on Werkzeug, Jinja 2 and good intentions.
Ghost
Ghost is a fully open source, adaptable platform for building and running a modern online publication. We power blogs, magazines and journalists from Zappos to Sky News.
Grav
The modern open source flat-file CMS
Kentico
Kentico is a fully integrated ASP.NET CMS, E-commerce, and Online Marketing platform.
MODx
modx is a free, fast & flexible, ajax and seo content management system. Leave behind endless compromises of legacy CMS. Rapidly develop any digital experience and power it with a tailor-made content management system.
Mezzanine
An open source content management platform built using the Django framework.
MightyCall
Virtual phone system that lets you run your business from anywhere.
Opps CMS
Opps is a platform or toolkit to build a CMS developed with Django, accompanies many packages that aim to meet the need of major content portals. Furthermore the Opps has a flexible structure for creating new apps.
ProcessWire
ProcessWire is a PHP5-based open source CMS/CMF built to save you time and make development fun at any scale. It works the way you do.
Quokka CMS
CMS made with Flask & MongoDB
SilverStripe
Make Digital Transformation happen
Strapi
Strapi is a free and open-source headless CMS delivering your content anywhere you need.
Keep control over your data. With Strapi, you know where your data is stored, and you keep full control at all times.
Tiki Wiki CMS Groupware
Tiki Wiki CMS Groupware, also known as Tiki (or TikiWiki), is a full-featured, web-based, multilingual, all-in-one Free/Libre Open Source Software solution. Tiki can be used to create all kinds of web apps, portals, knowledge bases, intranets, etc.
Wagtail
Wagtail is a mobile community for dog lovers.
WordPress
WordPress is web software you can use to create a beautiful website or blog. We like to say that WordPress is both free and priceless at the same time. Extend WordPress with over 55,000 plugins to help your website meet your needs.
concrete5
An open source content management system. A point and click, free CMS that runs on a web server.