The WordPress rich content management system can utilize plugins, widgets, and themes.

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Publish by web and email newsletter, with member signups and subscription payments.

Drupal is an open source content management platform powering millions of websites and applications.

Joomla! is an open source content management system.

Redmine is a flexible project management web application written using Ruby on Rails framework

MediaWiki is a free software open source wiki package written in PHP.

Odoo (formerly known as OpenERP) is a suite of open-source business apps.

XWiki: The Advanced Open Source Enterprise Wiki.

YOURLS is a set of PHP scripts that will allow you to run Your Own URL Shortener.

Monica – the Personal Relationship Manager.

The comprehensive CMS for small to medium sized businesses and non-profits.

Plone is a free and open source content management system built on top of Zope.

Silverpeas is a turnkey and open-source Collaborative and Social-Networking Portal.