Free open source content management system 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.

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.

Nelisys project is Open Source Web-based Management System, to manage and monitor system and network including Router, Switch, Wi-Fi Access Point, Server, Networking services, etc.

There are performance and fault management function.

X-ITEC CMS/R project is a German content management system.
Enhancements:
- More than 200 new features.

Apache OFBiz is an open source enterprise automation software project licensed under the Apache License Version 2.0.
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, fixed assets)
- 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!

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!