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WordPress is a state-of-the-art semantic personal publishing platform with a focus on aesthetics, web standards, and usability. What a mouthful. WordPress is both free and priceless at the same time. More simply, WordPress is what you use when you want to work with your blogging software, not fight it.
A full-featured, web-based, multilingual (40+ languages), tightly integrated, all-in-one Wiki+CMS+Groupware, Free Source Software (GNU/LGPL), using PHP, MySQL, Zend Framework, jQuery and Smarty. Tiki can be used to create all kinds of Web applications, sites, portals, knowledge base, intranets, and ... [More]
WordPress MU, or multi-user, is designed to do exactly that. It is most famously used for WordPress.com where it serves tens of millions of hits on hundreds of thousands of blogs each day.
A free, flexible, elegant, easy-to-use content management system for all kinds of websites, even weblogs.
It includes all the features of traditional blog tools, and extends them with evolved features such as file & photo management, advanced skinning, multiple blogs support. multilingual as well as detailed user permissions and third party plug-ins.
Seagull is a mature OOP framework for building web, command line and GUI applications. Licensed under BSD, the project allows PHP developers to easily integrate and manage code resources, and build complex applications quickly.
Pivot is a web-based tool to help you maintain sites like weblogs, online journals and other dynamic websites. It is written in PHP, and runs on either MySQL or Flat Files as a database.
Nucleus allows you to easily maintain your own weblog(s) on your own server. It offers a system that is easy to install, but still offers maximum flexibility. (PHP4/MySQL)
Interchange is an open source e-commerce server and application server. Aside from e-commerce catalog and shopping cart applications, it can also be used for other purposes such as database display and other dynamic websites. It is written in Perl and can be extended with the full resources of CPAN.