Movable Type is the main challenger to WordPress for a personal blog platform, and supports multiple users, Themes, and Tags.
License: GNU
Programming Language: Perl
Main advantages: Blogs
Disadvantages: Too closely tied to commercial products and services compared to most Open Source communities, Perl.
Outlook: Look for MT to fall off the list as other of the blogging platforms below increase in popularity, but sustain development as PR for the company’s commercial offerings.
Pligg CMS democratizes websites by giving users a voice. Members can publish content and cast their vote on articles and comments, pushing the most appropriate content to the top of the site. Pligg's emphasis on voting for the best content promotes the most popular content on your website. Pligg is a Digg clone that provides social bookmarking functionality for websites, allowing users to post links, vote them up or down, and leave comments.
License: GPL
Programming Language: PHP
Main advantages: Best for Social Bookmarking, can be themed and extended to build top quality sites like Mixx, Redditt, Del.icio.us, etc.
Disadvantages: difficult to install, mod rewrite problems, poor support on community boards, questionable Open Source future.
Outlook: With the 1.0 release of Pligg upcoming within a couple of months, look for a big surge of use back to this platform but watch out for increased commercialization.
Moodle is one of the most unique CMS platforms on this list, designed specifically for Course Management and Education, and used for online learning platforms.
License: GNU
Programming Language: PHP
Main advantages: Huge user and development community, online education, no real competitors or similar products, extremely powerful.
Disadvantages: not really applicable for most web design purposes.
Outlook: Look for this “Modular Object-Oriented Dynamic Learning Environment” to continue to be the standard online operating system for education and spawn many interesting mashups with other CMS platforms as well as many more modules & extensions.
Media Wiki invented a whole new way of working on the web, and is a CMS for collective authoring of documents, used to power the one of the largest and most popular sites on the internet, Wikipedia.
License: GPL
Programming Language: PHP
Main advantages: If you need a wiki, it is the best.
Disadvantages: Does not include many other functions / extensions of other CMS platforms, doesn’t theme well, most sites look the same.
Outlook: Follows the model to success of doing one thing extremely well, has the support of the Wikipedia Foundation, very popular authoring model
Joomla has one of the largest user communities of any CMS, everything you need and more to develop social networks, ecommerce, & archive sites.
License: GPL
Programming Language: PHP
Main advantages: Professional standards, internationalization, customization.
Disadvantages: too many commercial products for Open Source development, difficult to learn.
Outlook: Strong challenger for the top CMS spot, commercialization of extensions should continue to provide many income opportunities for 3rd party developers.
WordPress is a simple and elegant CMS, perfect for single user blogs, with a large number of themes and modules available online.
License: GPL
Programming Language: PHP
Main advantages: Easiest CMS to use, customize, and extend.
Disadvantages: Lacks many of the social networking functions, ecommerce, forums, wikis, etc. used on more expansive sites.
Outlook: Best for personal publishing, huge user community, will continue to be the preferred choice of bloggers for years.
Drupal gets the top nod because of its ease of use, vast number of modules, great user, developer, and support community.
License: GPL
Programming Language: PHP
Main advantages: core CMS, Views, CCK, Organic Groups, & huge library of contributed modules.
Disadvantages: complex, needs more top quality themes, frequent security upgrades.
Outlook: Huge potential to continue growth and expansion on this platform over time.
