PyleWiki is a WikiClone written entirely in Python that allows a group of people to collaboratively edit a tree of webpages using nothing but their browser and a simple, text-based markup language. This particular WikiClone has a few extensions to the original: attachments to pages, user authentication (primitive), and the use of templates for page styling among others.
Terbidium (formerly 'Websource') is a Web portal like XOOPS, PHP-Nuke, and a million other portal-style sites. It can be used as a OOP framework for quickly building a new site, or as-is for a news portal system. It features basic user registration, authentication, and preferences system, several user-selectable themes, with templates for building more, site administration (Web-based) for all site features, session support, including hit tracking and reporting (for pages and ad banners), Web hit tracking, and more.
PHPX is a Web portal system, blog, Content Management System (CMS), forum, and more. It is designed to allow everyone to be able to have feature-rich, interactive websites even if you do not know a bit of programming. Some key features include fully-integrated forums, downloads, an image gallery with slideshow and auto-thumbnailing, support ticket system, a GUI interface for Web page content management, news with topics and instances, and a whole lot more. It allows you to fully customize the look of your site.
Conten Board for Desktop and Handheld allows you to maintain articles on your Web site from a desktop or handheld device. The articles can be viewed from a desktop browser, PDA browser, or other PDA software. It has been tested on Palmscape, Handspring Blazer, and iSilo (using Sony Clie).
Drivel is a GNOME client for working with online journals, also known as weblogs or simply blogs. It retains a simple and elegant design while providing many powerful features, including support for LiveJournal, Blogger, MovableType, Advogato, and Atom journals. (Systems based off these are also supported, including WordPress and Drupal.)
The RealizationEngine is designed from the ground up to facilitate group communication and collaboration. It will store that communication to built and manage an institutional knowledge base. It is accessible from any Web browser or Web-enabled device. Classified information is easily restricted to authorized individuals. Information can be compartmentalized, restricted, or published openly, as appropriate, all from the same system. Ideas are coherently threaded, and every message is searchable in a single location and in the context of the messages related to it.