Structr!

FlockDB is a distributed graph database for storing adjancency lists, with goals of supporting:

Wagtail is a content management system built on Django. It's focused on user experience, and offers precise control for designers and developers.

Wikibase is the software that runs Wikidata, but is also usable for other projects beyond that. Wikibase allows the collaborative editing of structured data on top of MediaWiki. It is optimized for graph-like, schema-poor data, not for tabular and strongly pre-structured data.

Bitsy is a small, fast, embeddable, durable in-memory graph database that implements the Blueprints API. It supports ACID transactions with optimistic concurrency control and on-disk persistence.

Bootstrap ready CMS for free. Just download and create kick-ass website in a few minutes.

Readz is a powerful and flexible browser-based CMS for building and managing responsive websites. Forget plugins and extensions. Readz comes fully equipped with all of the design, marketing, high-speed architecture, and integration tools needed to create fully optimized pages in just a few minutes.

The FlatSiteBuilder is a very easy to use content management system (CMS) and content creation tool running as a desktop application on Linux. You are able to build web content which you can host on github pages for free or any other web space provider. Because all of the pages are beeing build on the desktop it is the fastest content management system available. No code is executed on the web server.