Omeka!

Chamilo is an open-source (under GNU/GPL licensing) e-learning and content management system, aimed at improving access to education and knowledge globally. It is backed up by the Chamilo Association, which has goals including the promotion of the software, the maintenance of a clear communication channel and the building of a network of services providers and software contributors.

Canvas is the new, open source learning management system that's revolutionizing the way we educate. Easy to learn, easy to use.

Apostrophe is a design-driven, in-context CMS built on Node.js and MongoDB. It provides the tools to develop both simple and complex content-driven websites through simple templating and modular functionality. The editing experience is designed around the idea that content mangement should be easy, and therefore editors can create and manage their content right on the page itself.

The edx-platform is the main repository of edX Code covering both the LMS and the authoring tool, Studio. It also includes XModules and various graders.

Portal CMS is a free and open source content management system with a powerful integrated page builder.

eFront is an easy to use, visually attractive, SCORM certified, eLearning and Human Development Platform.

Open Elms is an open source total e-learning solution which includes an e-learning Learning Management System (e-LMS) and Content Management System (e-CMS) for rapid application development. Open Elms is open source so it is an entirely free e-learning system.

Historically, the community has aligned around a single project, the Sakai Collaboration and Learning Environment (CLE). This project has also drawn in the Open Source Portfolio (OSP), including it in the Sakai CLE.

Modern, fast and secure content management system based on Bootstrap 3 using the latest technology.

CSZ CMS is an open source web application that allows to manage all content and settings on the websites. CSZ CMS was built on the basis of Codeigniter and design the structure of Bootstrap, this should make your website fully responsive with ease.

If Wordpress is overkill for you, try Sitecake drag and drop editing. Edit static HTML or PHP websites. Database is not required.

Koha is the first free and open source software library automation package (ILS). Koha’s feature set continues to evolve and expand to meet the needs of its user base.