Free open source content software for linux

Sequoia ERP is a true enterprise-class open source ERP solution. It combines the advanced features and scalability required for enterprise software with the flexibility and low cost of ownership that only open source can deliver.
Main features:
- Full Suite of integrated applications that deliver a 360-degree view of your business.
- Compatible all major open source and commercial relational databases, including MySQL, PostgreSQL, Oracle, Sybase, and Microsoft SQL Server.
- Runs on Linux, Unix, and Windows operating platforms.
- Service-Oriented Architecture for easy interoperability with external or legacy applications.
- Remote and local synchronization for scalability and high availability.
- Workflow for adapting to unique business processes.
- Available under the business-friendly MIT Public License.

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.

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.

Rembassy project is the base architecture for a server monitoring system inside the context of the open source movement.

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!

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!