Open Source CMS

Blogging

Wordpress

Wordpress is the most widely used Open Source blogging platform with a huge developer community. It also has hundreds of free plugins and themes making it an all round excellent choice for bloggers.
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Textpattern

Textpattern is a flexible, elegant and easy-to-use content management system optimised for blogging. Like most CMS, it is coded in php and requires a mysql database for operations.
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Nucleus

Nucleus CMS is an open-source blog management software package written in PHP, with a MySQL backend, it allows for multiple blogs and authors, easy publishing, commenting, RSS, archiving, search and more.
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Habari

Habari is a "next-generation free software blogging patform" still in development but backed by some of the web's most respected coders and developers. Habari will grow to be something special.
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Portals

Drupal

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.
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Joomla!

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.
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e107

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.
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Plone

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.
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Symphony

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.
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Pligg

Pligg is a PHP/MySQL CMS with a Web 2.0 feature set allowing users to easily create digg-type websites with an integrated user voting system.
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Forums

Simple Machines (Used to power the OSLiving forums)

Simple Machines Forum (SMF) is professional grade community building software with a custom template system that gives you control over the layout and style of your forum. Highly recommended.
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PHPBB

PHPBB was launched in 2000 and has become one of the standard Open Source forums used worlwide. It has a large and highly customisable set of key features coupled with a standards compliant interface.
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BBPress

BBPress comes from the creators of Wordpress, it is forum software with a focus on web standards, ease of use, ease of integration, and speed.
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Vanilla

Vanilla is an open-source, standards-compliant, multi-lingual, fully extensible discussion forum software. It is extremely lightweight at only 386k! A perfect solution for a simple forum.
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MyTopix

MyTopix is a discussion forum poised to compete with some of the other players in the bulletin board market. It has all the features you need to get a community up and started quick and nothing that you don't.
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Wiki

MediaWiki

MediaWiki is the information sharing software package that Wikipedia is built on. It is now used by several other projects of the non-profit Wikimedia Foundation and by many other wikis besides.
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DocuWiki

DokuWiki is a standards compliant, simple to use Wiki, mainly aimed at creating documentation of any kind. It is targeted at developer teams, workgroups and small companies.
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WikkaWiki

WikkaWiki is a flexible, standards-compliant and lightweight wiki engine written in PHP, which uses MySQL to store pages. Designed for speed, extensibility, and security.
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E-learning

Moodle

Moodle is a course management system - an Open Source software package designed using sound pedagogical principles, to help educators create effective online learning communities.
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DrupalEd

Built on the popular Drupal CMS system, DrupalEd can be used as an informal and/or formal learning site where students, teachers, classes etc have comparable and/or hierarchical permissions.
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Claroline

Claroline is an Open Source eLearning and eWorking platform allowing teachers to build effective online courses and to manage learning and collaborative activities on the web.
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Dokeos

Dokeos is a learning management system used in more than 600 companies and public administrations to manage e-learning and blended learning programmes.
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Docebo

Docebo is an e-Learning platform (LMS and LCMS) that supports 12 languages, is compliant to the SCORM 1.2 standard, and different didactic models. Including: Blended, Self-Directed, Collaborative and even Social Learning through Chat, Wiki, Forums etc.
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