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.

Website Baker is a PHP-based Content Management System (CMS) designed with one goal in mind: to enable its users to produce websites with ease.

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

Microweber is an open source drag and drop CMS. The core idea of the software is to let you create your own website, online shop or blog. From this moment of creation on, your journey towards success begins. Tagging all along will be different modules, customizations and features of the CMS, among them many specifically tailored for e-commerce enthusiasts and bloggers.

Zend Framework (ZF) is an open source, object-oriented web application framework.

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.

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Bludit is a simple web application to make your own blog in seconds, it's completly free and open source. Bludit uses flat-files (text files in JSON format) to store the posts and pages, you don't need to install or configure a database.

OctoberCMS is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. A simple and modular CMS that grows with you, with a precise and beautiful interface that comes as second nature.

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

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

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

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

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

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

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.

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.