A Content Management System (CMS) is a piece of software that runs on a server. Typically a database application, a CMS makes it easy to publish and administrate content.
Here are some good Open Source CMS softwares.
Joomla
Joomla is an award-winning content management system (CMS), which enables you to build Web sites and powerful online applications. Many aspects, including its ease-of-use and extensibility, have made Joomla the most popular Web site software available. Best of all, Joomla is an open source solution that is freely available to everyone.
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Drupal
Drupal is a free software package that allows an individual or a community of users to easily publish, manage and organize a wide variety of content on a website. thousands of people and organizations are using Drupal to power scores of different web sites, including Community web portals, Discussion sites, Corporate web sites, Personal web sites or blogs, E-commerce applications, Resource directories, Social Networking sites etc.
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Mambo
Mambo is released under Version 2 of the GNU General Public license (GNU/GPL).The GNU/GPL provides for a person or persons to distribute Mambo for a fee, but not actually charging for the software itself, because Mambo is free. More Read Features
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XOOPS
XOOPS is an extensible, OO (Object Oriented), easy to use dynamic web content management system written in PHP. XOOPS is the ideal tool for developing small to large dynamic community websites, intra company portals, corporate portals, weblogs and much more.
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TYPO3
TYPO3 is a free Open Source content management system for enterprise purposes on the web and in intranets. It offers full flexibility and extendability while featuring an accomplished set of ready-made interfaces, functions and modules. More Features
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Cushy CMS
CushyCMS is a Content Management Systems (CMS) that is truly simple and also happens to be free. It’s built from the ground up with ease of use in mind – for both content editors and designers. It’s such a simple CMS that it takes less than 3 minutes for a web designer to implement.
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modx CMS
MODx helps you take control of your online content. An Open Source PHP application framework, it frees you to build sites exactly how you want and make them 100% yours. Zero restrictions and fast to build. Super-simple templates in regular HTML/CSS/JS (any lib you want). Registered user systems and a killer community. More Features
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SilverStripe CMS
The SilverStripe CMS is a flexible open source Content Management System that gives everyone involved in a web project the tools they need to do their jobs.
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TYPOlight
Accessible Web Content Management System, Uses Ajax and Web 2.0 technologies, Multi-language support, Cross-browser CSS framework generator, Built-in file manager and search engine, Live update service, Accessible XHTML strict output, Front end output 100% template based, Versioning and undo management
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dotCMS
dotCMS is an open source software company specializing in web content management (wCMS). We offer professional services, training, installations and support for our products.
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umbraco
Open source CMS based on Microsoft’s ASP.NET.
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CMS Made Simple
CMS Made Simple is an open source (GPL) package, built using PHP that provides website developers with a simple, easy to use utility to allow building small-ish (dozens to hundreds of pages), semi-static websites.
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WordPress
WordPress is blogging platform, but that doesn’t mean that it can’t be used for other things as well. Many sites are using WordPress as a content management system (CMS) and they have now issue with that.
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Great list. Thanks for sharing !