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

Nibbleblog is easy, fast and free CMS Blog

Joose is a complete modern object system for JavaScript based on concepts from many programming languages such as Ruby, Smalltalk, Perl and, well, JavaScript.

Drupal is an open-source platform and content management system for building dynamic web sites offering a broad range of features and services including user administration, publishing workflow, discussion capabilities, news aggregation, metadata functionalities using controlled vocabularies and XML publishing for content sharing purposes.

Monstra is a fast and small content management system written in PHP! Monstra is the best CMS to manage a small-business website.

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

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.

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.

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

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.

Java Hosting packages on Linux servers.

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

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

JSP Hosting on Linux Servers.

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

Adult Java Hosting packages on Linux Servers.

Private JVM hosting with pre-installed Tomcat server.

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".