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Chyrp is a blogging engine designed to be very lightweight while retaining functionality. It is powered by PHP and has very powerful theme and extension engines, so you can personalize it however you want.

Tiki is a CMS/Groupware which offers a large number of features "out-of-the-box" arguably more than any other Open Source Web Application. It can be overwhelming, even to an experienced user or administrator.

sNews is a completely free, standards compliant, PHP and MySQL driven Content Management System. sNews is extremely lightweight, simple and customizable. It's easy to install, and easy to use via a simple web interface. sNews consists of only one core engine file, one independent template file and its accompanying CSS stylesheet file, plus an .htaccess file that makes all URLs search engine friendly.

TwistPHP is an open-source web framework.

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.

Croogo is a free, open source, content management system for PHP. It is powered by CakePHP MVC framework.

LiveSite is a cost effective solution for smaller organizations that need enterprise features without the cost and complexity of enterprise solutions.

Pluck is your small and simple content management system, written in php. With pluck, you can easily manage your own website without knowledge of programming languages.

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

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".

Google Web Toolkit, or GWT Web Toolkit, is an open source set of tools that allows web developers to create and maintain complex JavaScript front-end applications in Java.

Magnolia is an open-source digital business platform with a content management system (CMS) at its core.

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

Liferay makes software that helps companies create digital experiences on web, mobile and connected devices.

LogicalDOC is a free document management system that is designed to handle and share documents within an organization.

Java Hosting packages on Linux servers.

OpenCms is an open source content management system written in Java.

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