BuildACommunity.com
   Ecreations Software provides a collection of scripts for online communities, such as e-cards, forums, classifieds, chat, mailer and galleries. [Linux]
   http://buildacommunity.com/

ESX Engineering
   Ready-to-use software platform that delivers a total environment for development and management of community based sites.
   http://www.esxinc.com/

Inchima
   Software and portal solutions for online communities. Modules include discussion forums, content management, messaging and directories as well as custom components.
   http://www.inchima.com/

OpenACS (Open Architecture Community System)
   Open-source toolkit for building scalable community-oriented web applications. Features a large database model of web collaboration, and over 70 application building blocks. (Linux or BSD, Aolserver, Oracle or PostgreSQL)
   http://openacs.org/

Specialty Match Network
   Customized software for community facilities such as online matching, polls, forums, weblog, chat and email. Remote hosting services available. [.NET]
   http://www.specialtymatch.com/

Thumper
   Perl scripts provide member web space, chat rooms, discussion boards and photo galleries. Remote hosting also available. [Perl]
   http://www.usgenealogy.net/infotb.html

Web Crossing
   Software bundle that includes discussion groups/bulletin boards, integrated newsgroups and mailing lists, full email services, calendar services, auctions, real-time chats and live events. Also offers hosted services. (Linux, Windows, MacOS)
   http://www.webcrossing.com/Home/Resources/Articles/