cdBB [Coldfusion Driven Bulletin Board] is an open-source message board written using technologies like Coldfusion, XML and Java. It goals to be a complete open source enterprise solution for online communities.
Squishdot is a web-based news publishing and discussion product for Zope. It is written in Python with the ability to script in DTML and runs on Linux, *BSD, Unix and Windows 95/98/NT/200.
A free replacement (in Python) for Radio Community Server and a miniature application server, with an embedded almost-OO database and a very quick script handler.
kLJ is a LiveJournal client for KDE, based on the official win32 client, providing the
same features and some additions as they are requested. (http://www.livejournal.com/)
A Web-Based system for activists to share information and organize for events. Including a content mangement system for the public as well as services for the users. Users will be able to communicate via forums/listservs.
SICKnotes (Site Inventory, Configuration, and Knowledge) is a permissions-based Web tool that assists with inventory, system changes, contact info, and knowledge for anything from a small startup to a data center. SICKnotes requires Python and MySQL.
Referendum is a community-creation web toolkit focused around issues
and resolution through voting. A web aplication used for understanding
and empowering on-line communities through the democratic process,
based on a completely open source foundation
www.ufo-daily.com is a website for the discussion and debate of UFO's. The code for the website is fully open-source and this repository is the central source for that code.
Metascore is the system which will run metagovernment.org and any number of other community governance systems. It is a versionated policy-generation and discussion system combined with a recursive scoring system for ranking content and perhaps users.