Free open source content management software for linux

Joomla! is one of the most powerful Open Source Content Management Systems on the planet. Joomla! is used all over the world for everything from simple websites to complex corporate applications. Joomla! is easy to install, simple to manage, and reliable.
Joomla! is a production of Open Source Matters, the same team that brought you the award winning Mambo Content Management System. OSM has taken their final stable version of Mambo (4.5.2.3), given it a spring clean and named it Joomla! 1.0 In addition, several small features that were going to be released in Joomla! 1.1 have been brought forward and included in this release.
Main features:
- Flexible
- Simple
- Elegant
- Customizable
- Powerful

eZ publish is a popular open source content management system and development framework. eZ publish project is distributed, developed and supported by eZ systems. eZ systems is a commercial company, founded by experienced and open-minded people. The company builds its business by providing services around the eZ publish system. For more information about eZ systems, read the "What is eZ systems?" section.
eZ publish allows the development of highly professional and customized internet solutions and dynamic web applications. It can be used to build anything from a personal homepage to a multinational corporate website with role based multiuser access, online shopping, discussion forums and other advanced functionality. In addition, because of its nature of openness, eZ publish can be easily plugged into, communicate and coexist with existing IT-solutions.
eZ publish comes with a wide range of advanced built-in features, which make it possible to develop professional, complex, secure and reliable solutions within a short amount of time. In addition to the built-in features, the system allows for extensions and custom modifications in almost any direction. Unlike other content management systems, eZ publish delivers a flexible, generic solution with very few limitations. In other words, this is a scalable and dynamic system that companies and organizations can grow with.
eZ publish is platform independent. It can be used on Windows and several UNIX variants such as OS X, Linux, FreeBSD, Solaris, IRIX, etc. In addition, eZ publish is also database independent; if a specific database isnt supported, it is possible to write a driver without modifying any kernel code.
eZ publish is open software, supporting open standards. The software is constructed following strict development processes in order to ensure high technical quality and usability.
eZ publish is dual licensed. There is a GPL (General Public License) and a professional license. Using the GPL license, people can build their own open source applications and thereby contribute to the development of free and open software. The professional license allows companies to make and sell commercial software that is developed using and/or built upon the eZ publish system.
Enhancements:
- Several bugfixes and enhancements.
- The command line package tool ezpm.php has been updated: list, import, and install commands have been changed to match the admin interface functionality.
- The ezinstallscript and ezextension items are supported by the add command. ezpm is allowed to set the vendor.
- Enhancement #010347 (progress output for correctxmltext.php and updatetypedrelation.php) has been implemented.

Universe project is a Open Source Master Of Orion-like game.

Universe is an Open-Source game which resembles Master Of Orion. It is written in Java.

The goal is to have as few arbitrary limits as possible, allowing games as large as you wish. It also supports a concept called "Schemes" which allows programmers to develop distinct rule sets and extensions.

Open Source in Tab is an extension which opens the pages source file in a new tab.

Opens the pages source file in a new tab. Has a preference to either open source in a new tab or existing tab.

The Open For Business Project is an open source enterprise automation software project licensed under the MIT Open Source License.
By open source enterprise automation we mean: Open Source ERP, Open Source CRM, Open Source E-Business / E-Commerce, Open Source SCM, Open Source MRP, Open Source CMMS/EAM, and so on.
Main features:
- advanced e-commerce
- catalog management
- promotion & pricing management
- order management (sales & purchase)
- customer management (part of general party management)
- warehouse management
- fulfillment (auto stock moves, batched pick, pack & ship)
- accounting (invoice, payment & billing accounts)
- manufacturing management
- general work effort management (events, tasks, projects, requests, etc)
- content management (for product content, web sites, general content, blogging, forums, etc)
- and much more all in an open source package!

Xitnalta Content Management System (xcms) provides a virtual filesystem library to deal with content from different sources (a real filesystem, a database, etc.) and in different formats.

Xitnalta Content Management Systems goal is to provide yet another way to access and manage data both locally and over the Internet.

Open Tranquera is a repository of reusable components for J2EE application development.

There are UI extensions, Services, and a Persistence layer, integrated with existing open source frameworks.

AigaionPaste provides an open source bibliography management system.

Aigaion is an open source bibliography management system with excellent bibtex im- and export facilities.

This plugin allows you to easily copy BIBTEX or RIS into your Aigaion biblography database.