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The Spry Framework is an open source Ajax framework developed by Adobe Systems which is used in the construction of Rich Internet applications.

CakePHP is an open-source web framework. It follows the model–view–controller (MVC) approach and is written in PHP, modeled after the concepts of Ruby on Rails, and distributed under the MIT License.

qooxdoo is a universal JavaScript framework with a coherent set of individual components and a powerful toolchain.

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.

Geeklog is a PHP/MySQL based application for managing dynamic web content.

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.

Socket.IO is a JavaScript library for realtime web applications. It enables realtime, bi-directional communication between web clients and servers.

Anchor is a super-simple, lightweight blog system, made to let you just write.

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.

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.

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".

JSP Hosting on Linux Servers.

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

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

Private JVM hosting with pre-installed Tomcat server.

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.

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

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