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Drupal   Drupal is an advanced open-source content management tool for creating      dynamic websites, which provides a broad range of features and services such      as: user administration, publishing workflow, discussion capabilities, news      aggregation, metadata functionalities using controlled vocabularies and XML      publishing for content sharing purposes.
Joomla!   Joomla! is one of the most powerful Open Source Content Management Systems      on the planet. It is used all over the world for everything from simple      websites to complex corporate applications. Joomla! is easy to install,      simple to manage, and reliable. Joomla! is used all over the world to power      everything from simple, personal homepages to complex corporate web      applications. 
Mambo   Mambo is a dynamic Web content management tool that is capable of building      sites from several pages to several thousand. It is a full-featured content      management system that can be used for everything from simple websites to      complex corporate applications. Continue reading for a detailed feature      list. Mambo comes complete with 10 built-in modules, a WYSIWYG editor, site      statistics, an admin interface, multi language support, custom module      support, and more. 
Geeklog   Geeklog is a weblog powered by PHP and MySQL. It allows you within minutes      to set up a fully functioning dynamic website, and has many features to get      you started. It provides you with user-system, allowing members of the      public to register for your site and submit stories. Also it have a comment      system, allowing users to comment on posts made to your site. Using the      Block system, you can put information anywhere on your site. The Plugin      system allows you to extend Geeklog, without having to code any new PHP. The      Theme system allows the users to select what layout they want to view. 
Moodle   Moodle is a course management system designed to help educators create      quality online courses. Available in 34 languages and features a WYSIWYG      HTML editor. The teacher has full control over all settings for a course.      There is a flexible array of course activities (Forums, Journals, Quizzes,      Resources, Choices, Surveys, Assignments, Chats, Workshops), user logging      and tracking, mail integration and much more. 
Nucleus   Nucleus is a Content Management System (CMS): a powerful set of PHP scripts      that allow you to maintain one or more weblogs or online journals. A      powerful blog script featuring multiple blogs, multiple authors, drafts and      future posts, bookmarklets. Nucleus is far more flexible and powerful than      most of the CMS scripts, it expresses the values that guided its birth:      flexibility, security, and computational elegance. 
Open Realty   Open-Realty is free web based listing management application for real estate      websites for real estate websites. It is intended to be both easy to setup      and use. Written in PHP, Open-Realty is designed to be a fast and flexible      tool for your website. With a large open-source community working with this      application, and solid management from Transparent Technologies open-realty      is the top choice for use on your website. 
WebSiteBaker   Website Baker is a PHP-based Content Management System (CMS) designed with      one goal in mind: to enable it's users to produce websites with ease. This      Website Baker "Start" website is a resource for people wanting to find out      more about Website Baker, and get a "start" with the project and our      community. 
fuzzylime (cms)   fuzzylime (cms) is the easiest way for you to run your site and keep it      up-to-date. Once installed, you can update from any internet-connected PC in      the world - you don't even need to know HTML! It has tons of features so      whatever you want from your site; chances are this script will be able to do      it for you. 
php-fusion   PHP-Fusion - a light-weight open-source content management system (CMS)      written in PHP. It utilises a mySQL database to store your site content and      includes a simple, comprehensive adminstration system. PHP-Fusion includes      the most common features you would expect to see in many other CMS packages. 
phpWebSite   phpWebSite provides a complete web site content management system. Web-based      administration allows for easy maintenance of interactive, community-driven      web sites. phpWebSite's growing number of modules allow for easy site      customization without the need for unwanted or unused features. Client      output from phpWebSite is valid XHTML 1.0 and meets the W3C's Web      Accessibility Initiative requirements. phpWebSite allows an individual or      group to easily maintain an interactive, community-driven web site. 
xoops   XOOPS is an extensible, OO (Object Oriented), easy to use dynamic web      content management system written in PHP. XOOPS is the ideal tool for      developing small to large dynamic community websites, intra company portals,      corporate portals, weblogs and much more. 
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4Images Gallery  4images is a powerful web-based image gallery management system. Features      include comment system, user registration and management, password protected      administration area with browser-based upload and HTML templates for page      layout and design.
Coppermine  Coppermine Photo Gallery is an advanced, user-friendly, picture gallery      script with built-in support for other multi-media/data files. The gallery      can be private, accessible to registered users only, and/or open to all      visitors to your site. Users, if permitted, can upload pictures with their      web browser (thumbnail and intermediate sized images are created on the      fly), rate pictures, add comments and even send e-cards. The site      administrator determines which of the features listed above are accessible      by registered and non-registered users. 
Gallery2  Gallery is a web based software product that lets you manage your photos on      your own website. You must have your own website with PHP and database      support in order to install and use it. With Gallery you can easily create      and maintain albums of photos via an intuitive interface. Photo management      includes automatic thumbnail creation, image resizing, rotation, ordering,      captioning, searching and more. Albums and photos can have view, edit,      delete and other permissions per individual authenticated user for an      additional level of privacy. 
plogger  Plogger is the next generation in open-source photo gallery systems. A web      application not bloated with superfluous features or complicated      configuration settings. Plogger is a simple yet powerful tool - everything      you need to share your images with the world. Plogger is your photos      integrated into your website, a fully featured photo sharing package with an      attractive and easy to use administrative interface that makes managing your      galleries a breeze. Integrating our gallery software into your website is as      easy as inserting three lines of PHP code. 
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