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Locomotive is an open source CMS for Ruby on Rails. It’s flexible and integrates with Heroku and Amazon S3.

Managing News is an RSS/Atom based news tracker with search, republishing and mapping capabilities.

Open Atrium is a team collaboration tool with group spaces that allow different teams to have their own conversations. It comprises six core features – a blog, a wiki, a calendar, a to do list, a shoutbox, and a dashboard.

Drupal is open source social publishing software that empowers people to easily publish, manage and organize content on a website. Acquia Drupal is a packaged distribution of Drupal core plus commonly-used add-on modules to simplify getting started. Drupal is open-source software distributed under the GPL and is maintained and developed by a community of thousands of users and developers. Drupal is free to download and use.

Drupal Commons is social business software providing organizations with a complete solution for forming collaborative communities. It combines popular social web features for users and community management tools for site owners. It’s a complete solution, ready-to-use – bypassing the Drupal module and theme selection, setup, and configuration done when building from normal Drupal building blocks. Just install, and go.

Magnolia is a powerful Open Source CMS whose page editing interface enables authors to lay out content exactly as it would appear to the website visitor. Magnolia uses Java technology based on open standards to allow for tailor-made solutions and offers enterprise-grade support and services via partners world-wide.

Google is expanding the Google Wave Federation Protocol towards a more complete application or “Wave in a Box”, an open source extension of their now discontinued real-time collaboration network.

Diaspora is a privacy-aware, personally controlled, do-it-all distributed open source social network.

Liferay Portal is an enterprise web platform for building business solutions.

MaiaCMS is an open source PHP based content management system (CMS). It is designed with simplicity in mind to help you easily build and maintain your web site.

The open source video CMS for centralizing all of your video and podcasting needs. MediaCore provides unparalleled organization, statistics, accessibility, and scalability.

Lovd By Less is an Open Source Social Network built with Ruby on Rails and comes with everything you need to build your community.

PivotX is primarily a blogging platform but if also allows you to maintain more complex websites.

WebGUI is an open source content management system built to give business users the ability to build and maintain
complex web sites. Today, WebGUI is in use as a framework in several Global 1000 companies and is the driving force
behind countless business and enterprise environments.

Only the most promising CMS platform available to date. Beat out CMS made simple this year for most promising new CMS. Solid system and even more free than the rest in that whatever you do with it – you can keep it proprietary. BSD Baby.

A powerful, flexible, and robust content management system with state of the art features and functionality. Mia can be used for anything from small personal sites all the way up to large enterprise portals and e-commerce websites.

Diferior (different + superior) is a multi purpose CMS that comes with all the necessary tools to easily publish and organize content on the Net. It is capable of distributing files via BitTorrent, HTTP and FTP protocols, has built-in forums, a sophisticated user system and more.

Umbraco is an Open Source CMS based on the ASP.NET framework with cross browser support and a rich feature set for developers, editors and designers.

Keep your family “Connected” with this content management system (CMS) designed specifically with family’s in mind.

OpenCms is an open source content management system based on Java and XML technology. The fully browser based user interface features configurable editors for structured content with well defined fields.

TutorialMS is a content management system that helps webmasters index and manage tutorials (written by them or by another site). It is designed so users can easily find the tutorial(s) they are looking for.

LightNEasy, a simple and light Content Management System and Website Builder. LightNEasy is not only a CMS, It actually creates plain, pure web pages for your whole website, making it SEO friendly and fast loading. Each time you add a page, alter the menus, it regenerates all pages again so that they remain fully integrated.

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.

Web 2.0 News Portal is a small and friendly Web 2.0 application for publishing News and Blog posts.

CMS Made Simple provides a fast and easy way to create a web site and manage its contents. Integrate blogs, forums, polls, shopping carts and much more with this comprehensive, hands on CMS.

Symphony is a web publishing system for web developers in XML and XSLT. It is customisable and flexible and can be used for anything from a publishing environment to organising your website’s url structure.

Plone is an open source CMS suited for an internal website or may be used as a server on the Internet, playing such roles as a document publishing system and groupware collaboration tool.

e107 is a CMS written in PHP and using the popular open source MySQL database system for content storage. It’s completely free, totally customisable and in constant development.

Joomla! probably has the largest userbase for a CMS System. It is used to power everything from simple websites to complex corporate applications. Easy to install and manage, it has a vast amount of templates and plugins.

Drupal is an open source content management platform with a powerful range of features that supprt a variety of websites from personal blogs to large community-driven websites.