Techno Trade Web Based Message Board  
   Simple CGI-based messaging. Includes option to ban bad words. Site does not work in Netscape 3 or 4.
   http://technotrade.com/board/index.html

Advanced Forum  
   CGI application that implements discussions on a website.
   http://www.softcab.com/forum/

OpenACS  
   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]
   http://www.openacs.org/

DiscusWare  
   WWW discussion board software package that can be installed on a Unix or Windows 95/98/NT web server. Installation takes about 15 minutes and does not require hand-editing of the script files. Free and paid versions available.
   http://www.discusware.com/

TalkSpread  
   Commercial software suitable for private and public uses. Runs on IIS with a Microsoft SQL Server backend.
   http://www.talkspread.com/

BoardAide  
   Unofficial support forum for various message board systems.
   http://boardaide.com/

A-Forum  
   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.
   http://www.apdsoft.com/afo/aforum.htm

Ceilidh  
   Group discussion program, written in C, for the World Wide Web. Threaded bulletin boards for BeOS, Mac, OS/2, UNIX and Windows web servers.
   http://www.lilikoi.com/

Net.Polemics  
   A free ISAPI based bulletin board system. For Windows NT4/2000/XP servers. List of features, a working demo, and download.
   http://www3.telus.net/jz/conf/

SiteNet BBS  
   Shareware discussion forum package allows polls, moderation, email notification, password protection. Built-in search engine. Features, requirements, registration information, working demos.
   http://www.focalmedia.net/sitenetbbs.html

Vintage Threads  
   Free script for traditional threaded forums with no emoticons and no registration.
   http://www.heresyslair.net/download/vt.htm

aGNeS News Forum BBS  
   A bulletin board message system. It's free for non commercial use and run at WinNT, Solaris, Linux, FreeBSD.
   http://agnes.vestris.com/