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.

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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.

FlatPress is a blogging engine that saves your posts as simple text files. Forget about SQL! You just need some PHP.

e107 is a content management system written in PHP and using the popular open source MySQL database system for content storage. It's completely free, totally customisable and in constant development.

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.

Knockout is a JavaScript library that helps you to create rich, responsive display and editor user interfaces with a clean underlying data model.

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

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

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

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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.

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

XWiki is a free wiki software platform written in Java with a design emphasis on extensibility.

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".