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The PHP Smart.Framework (smart framework php) is a free, BSD licensed, open-source web framework that claims to fit small, medium as well as large web projects.

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.

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

Storytlr offers a single touch point for your online life in your own style. Easily post anything you find interesting, import your web 2.0 stuff and share your life online.

Unit testing framework for Javascript

Ajax Hosting on Linux Servers.

Saurus is Free, Open Source Software for Building and Managing Websites.

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

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.

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

Java Hosting packages on Linux servers.

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

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.

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

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