Do you want to add a Blogs to keep people informed of what you are doing... Do you have a product or service that you'd like to expand online with online store?
An Image Gallery system featuring unlimited categories/subcategories, web-based and FTP images upload, auto-thumbnails, comments, send a picture, rate a picture, random pictures, extensive administration panel. http://www.4homepages.de/
An Image Gallery system featuring categories and albums, thumbnails and intermediate size pics, search feature, new and random pictures, user management (private galleries, groups), user comments, e-cards feature, slideshow viewer. http://coppermine.sourceforge.net
A blog script featuring multiple blogs, categories/sub-categories, skins, search function, multiple languages, search engines friendly URLs. http://b2evolution.net/
A powerful blog script featuring multiple blogs, multiple authors, drafts and future posts, bookmarklets. http://nucleuscms.org/
WordPress is a blogging software with a focus on ease of use, elegance, performance, and standards with a huge selection of themes and plugins. http://wordpress.org/
An advanced portal with collaborative book, search engines friendly URLs, online help, roles, full content search, site watching, threaded comments, version control & blogging.
http://drupal.org/
Geeklog, "Out of the box", is a blog engine, or a CMS with support for comments, trackbacks, multiple syndication formats, spam protection, and all the other vital features of such a system. http://www.geeklog.net/
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. http://www.joomla.org/
A professional level yet easy to use Content Management System featuring inline WYSIWYG content editors, newsfeeds, syndicated news, banners, mailing users, links manager, statistics, content archiving, date based content, 20 languages, modules and components. http://www.mambo-foundation.org/
A straightforward content-management system designed for rapid deployment of community-based websites. Nice-looking templates, oriented toward document-sharing, clean interface. http://siteframe.org/
TYPO3 is a free Open Source content management system for enterprise purposes on the web and in intranets. It offers full flexibility and extendability while featuring an accomplished set of ready-made interfaces, functions and modules. http://www.typo3.com/
Zikula is a Web Application Toolkit, which allows you to run impressive websites and build powerful online applications. Zikula has received praise for the ease of use, quick and easy development, security, performance and flexibility. http://zikula.org/
One of the most popular community-based portals with a big choice of modules and languages. http://www.phpnuke.org/
An easy to use yet powerful shopping cart featuring unlimited categories and products, multiple payment gateways, downloadable products. The design is very easy to modify. http://www.cubecart.com/
A power-user shopping cart with a big variety of modules and support of almost every payment gateway. A big developers community is ready to offer custom solutions depending on your needs. http://oscommerce.com/
Zen Cart truly is the art of e-commerce; a user-friendly, open source shopping cart system. The software is being developed by group of like-minded shop owners, programmers, designers, and consultants that think e-commerce could be and should be done differently.
http://www.zen-cart.com/
A widely-popular open-source bulletin-board package, works well, simple user interface and admin panel, clean look, scales well, and can be customized. http://www.phpbb.com/
Elegant. Effective. Powerful. Free. SMF is all of the above. SMF is a next-generation community software package and is jam-packed with features, while at the same time having a minimal impact on resources. http://www.simplemachines.org/