SiteCake is a drag and drop CMS for simple websites. It lets you publish the content just by dragging it to your web page. It's CMS for static websites, with few pages only, to cover the niche below WordPress level of complexity.

b2evolution is an advanced weblog tool, i-e software allowing you to run your own blogs, newsfeeds or even photo stream.

Blosxom is a free-software weblog program (and simple content management system) written in Perl.

Plesk is a commercial web hosting platform with a control panel that allows a server administrator to set up new websites, reseller accounts, e-mail accounts, and DNS entries through a web-based interface.

Textpattern is a web application designed to help overcome the hurdles to publishing online, and to simplify the production of well-structured, standards-compliant web pages.

Yii is an open source, object-oriented, component-based MVC PHP web application framework.

SproutCore is an open-source JavaScript web framework.

Apache Roller is a Java-based Open Source "full-featured, Multi-blog, Multi-user, and group-blog server suitable for blog sites large and small".

eXo Platform is an open source, standard-based, Enterprise Social Collaboration Platform written in Java.

dotCMS is an open source content management system (CMS) written in Java for managing content and content driven sites and applications.

Java Hosting packages on Linux servers.

Private JVM hosting with pre-installed Tomcat server.

Hippo CMS is an open-source, dual licensed, Content Management System.

SmartClient is set of mobile and cross-browser HTML5 UI components combined with a Java-based Ajax framework, created by Isomorphic Software to build business web applications.

OpenKM is a Free/Libre document management system that provides a web interface for managing arbitrary files.

Ametys is a free and open source content management system (CMS) written in Java.