DotNetNuke is the most widely adopted web content management system (WCM or CMS) and application development platform for building web sites and web applications on Microsoft .NET.
OpenCms from Alkacon Software is a professional, easy to use website content management system. OpenCms helps content managers worldwide to create and maintain beautiful websites fast and efficiently. OpenCms is based on Java and XML
WordPress is a state-of-the-art publishing platform with a focus on aesthetics, web standards, and usability. WordPress started as just a blogging systems, but has evolved to be used as full content management system.
dotCMS is one of the fastest growing open source enterprise content management systems in the world. Twice recognized by Packt Publishing, and downloaded by tens of thousands of people, dotCMS is the choice for enterprise web CMS.
Plone lets non-technical people create and maintain information using only a web browser. Perfect for web sites or intranets, Plone offers superior security without sacrificing extensibility or ease of use.
N2 is a lightweight CMS framework that helps you build great web sites that anyone can update. Web content editors can enjoy a simple and enpowering web interface. Developers will benefit from a programmer friendly API that makes building web sites quick and fun. N2 is focused on removing redundant steps when working with content types and ASPX templates. All of development is done within visual studio.
TYPO3 is an enterprise class Web CMS written in PHP/MySQL. It's designed to be extended with custom written backend modules and frontend libraries for special functionality. It has very powerful integration of image manipulation.
TomatoCMS, an impressive open source Content Management System (CMS) powered by Zend Framework, jQuery and 960grid. TomatoCMS considers each web page made up of many different elements called widgets. You can easily create, customize the layout of your site like never before through a visual tool called Layout Editor. TomatoCMS has a lot of built-in widgets, and developers can easily create new widgets.
Hippo CMS (Hippo Content Management System) is the web-based graphical user interface that provides access to the content in the repository. It provides an easy way to create and manage your content, i.e. to write or upload, share, print, search, refer to, edit and structure content, assign rights to do so, have content automatically validated against your business rules and restore previous versions of the content.
PHP-Nuke is a Web Portal System or content management system. The goal of PHP-Nuke is to have an automated web site to distribute news and articles with users system. Each user can submit comments to discuss the articles.
Midgard is a persistent storage framework built for the replicated world. It enables developers build applications that have their data in sync between the desktop, mobile devices and web services. It also allows for easy sharing of data between users. Midgard does this all by building on top of technologies like GLib, libgda and D-Bus. It provides developers with object-oriented programming interfaces for C, PHP and Python.
Weceem is a CMS written with the Grails application framework (and associated plugins) that can be easily extended or embedded in your own Grails applications. There are numerous customisation points that allow you to tailor the security mechanisms, administration skin, url paths, scope for custom data types and server-side scripting using Groovy. It is built from the ground up to be embeddable as well as a standalone application.
Strelin is a fork of the great Joomla! 1.5 content management system. Joomla! 1.5 is so widely used content management system. As Joomla! is moving towards 1.6 with big core changes, Strelin has been started for those who want new features but don't want to get into possible extra migration work.