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Cascade Framework is a free CSS framework for creating websites and web apps.

Fusebox is a web application framework for CFML and PHP.

The Google Closure Library is a broad, well-tested, modular, and cross-browser JavaScript library.

Twig.js is a pure JavaScript implementation of the Twig PHP templating language.

WonderCMS is a completely free open source Content Management System, or in other words, a free website builder.

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

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

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".

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.

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

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

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.

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

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.