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Nucleus CMS is a flexible and easy to install content management system, aka blog software. It helps you to publish a website and lets writers do what they are best at: writing items or articles, without having to worry about formatting and markup.

Chaplin is an architecture for JavaScript applications using the Backbone.js library.

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.

Subrion is a stand-alone PHP content management system that is very easy to use. It comes with a ton of great features including full source editing, per-page permissions, user activity monitoring, and much more.

PyroCMS is an easy to use, powerful, and modular CMS and development platform built with Laravel 5.

Serendipity is a PHP-powered weblog application which gives the user an easy way to maintain an online diary, weblog or even a complete homepage. While the default package is designed for the casual blogger, Serendipity offers a flexible, expandable and easy-to-use framework with the power for professional applications.

MochiKit is a light-weight JavaScript library written and maintained by Bob Ippolito.

TwistPHP is an open-source web framework.

JSP Hosting on Linux Servers.

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".

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

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

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.

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

Java Hosting packages on Linux servers.

OpenWGA is Web Content Management computer software running on the Java Enterprise Edition Platform.

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.