An open-source version of the ArsDigita Community System, comprised of a Web server plus PostgreSQL database. Free download, documentation, FAQ, forums, links to existing sites using this solution. [Unix, source]
ISAPI server application. Discussion forum for MS IIS running on Windows NT/2000/XP. Shareware. Highlights, installation instructions, FAQ, examples of this forum in use.
CGI/Perl software for message boards, chat, survey, and files and links submission. Installs with one file. Very integrated. Includes support for templates and user profiles. Commercial.